Malicious PDF — malware analysis report

Static analysis result for SHA-256 729c09e6f718d1d3…

MALICIOUS

PDF

85.9 KB Created: 2021-05-29 13:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1202b21fd68bba8720221c9f116dfcbd SHA-1: 2483d05bca506cb1938705259060b136d986f2ed SHA-256: 729c09e6f718d1d3d6c6c7fe33e18915a12907e3c87c3ae54c4b909023a1138b
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to a redirector URL (https://yafferge.ru/strik?utm_term=wonder+la+leccion+de+august+libro+completo). This behavior, combined with the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=wonder+la+leccion+de+august+libro+completo In PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5ffe8ecd7d9a9.pdfIn PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/joropolutugawozove.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/a54c02c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6065f1c68804e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5feb7b21bd982.pdfIn PDF document text
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/ba411a9e112c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_601080eb5bf37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe1c0e31d536.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/lizexupuni_gefinu_wubetewafuba_bijiraga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdfd600-dcd6-4143-ab00-1093e1c3d8ff/89577603771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f20567-ce51-4388-a4bc-1fcd9cae5779/nintendo_ds_lite_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f47e412-9cc1-4401-af73-acd4dd6ecff5/facebook_login_account_password_free_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0818a4c4-1d02-49cf-904c-221fe6229380/au_clair_de_la_lune_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfabdd2-3ea2-42ba-9702-8d9e763436d8/love_yourself_lyrics_eminem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9be1cd4-fe24-4c3f-9b6a-55a559152d49/how_do_i_connect_my_hp_photosmart_printer_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22dc2ab8-c8fd-414c-831a-0448fcc3b0c3/zekizefibekipulitizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac533fd-6bb9-4fb4-9375-71bf93d895f6/my_bissell_proheat_2x_not_spraying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715446dc-b851-461c-801c-09532cb528cb/fall_guys_ps4_promo_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59931c28-7c3b-434a-bcbd-3aad642fdf49/what_are_the_main_types_of_literature_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d25374e-246b-4a66-bbc9-3839b719099c/8129778013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2f93f4-e08a-46bd-bc20-aeb9a0e2aff4/64782610440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9033310d-bf99-4e32-b751-6ddb3e715868/canon_mg5620_error_code_b203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3746d44-2600-4b1d-9614-7cc89d8f6b2a/hacksaw_ridge_full_movie_download_480p_openload.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8bd458-e56e-4def-a168-3a9e94bd9b1b/fikoxavu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 5548 bytes
SHA-256: 59ed92558c53ecc62234030bbf3c080e892f12d7a129aff54ec0ba8951beb5c9
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 12584 bytes
SHA-256: e52b79a80c902fe6a3988efc831c14c145a09e84745af45d3aa4821645f69fa7
font_02_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61