Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cef0a9f62c4afc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 06:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8939e32cc57b2a65e44ca7d69d436034 SHA-1: bb22bcdfaad3ddf2e7dd5856d4a3754c4f7f85e9 SHA-256: a4cef0a9f62c4afc1efd21460e806534358d48b20905412ea61c6f85bace4faf
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a link that redirects to a malicious URL, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is used to direct the user to a site that likely hosts a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dafemum.ru/wix?keyword=bash+manual+if In PDF document text
    • https://cdn.sqhk.co/zifeduwa/sjaiCJH/1_24_scale_drag_slot_cars_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/g0T4Z9J/remap_keyboard_function_keys_ubuntu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365591/normal_5ffda032c07aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384296/normal_5fffa2bbc492d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453117/normal_5fcbdc4291006.pdfIn PDF document text
    • http://ratubave.22web.org/carol_of_the_bells_flute_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_60228a71b0da3.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/IZ8guje/art_therapy_ideas_for_preschoolers.pdfIn PDF document text
    • http://vuxamajapaga.22web.org/rolugikemerexovegina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomaxod/xiweremi.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/what_powers_are_shared_between_the_house_and_senate.pdfIn PDF document text
    • http://fefugadabojenip.epizy.com/wowajetemer.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/xumokonibos.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/video_recorder_windows_xp_free.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/administracion_publica_descentralizada_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/vutonalasaguwoluw.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/dust_devil_barrage_guide_osrs.pdfIn PDF document text
    • http://rekutuvogunavur.rf.gd/vaaste_song_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/mimeralisekujazodisiseke.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/brrrr_book.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 4960 bytes
SHA-256: 9349799158d79fb621e09468674e6feda13ce64c52fdd417cef3b112b31986f4
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16208 bytes
SHA-256: e46b7292a1a644adb9432329985153b0ba8d3d944bc5df28bb955b10c7921f4e

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