Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ded9715c8c192b2…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 11:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aca4895c235da1533600bf0f00bea957 SHA-1: b6e09933dc26f62642be1b5655cc9954bfd3e6ff SHA-256: 0ded9715c8c192b2241e44dd6d64430e504c7acbb3676829b4c5dff3d52142fa
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://baarspo.ru/award?keyword=pathophysiology+of+anemia+of+chronic+disease+pdf, which is presented as a lure for a document download. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/award?keyword=pathophysiology+of+anemia+of+chronic+disease+pdf PDF link annotation
    • http://kamini33.ru/gumim3jesn.pdfIn PDF document text
    • http://masajsalonunuz.com/95033599895su9dy.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/gijoxogofazaguvar.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/fugfr24/when_will_cruise_ships_sail_again_royal_caribbean.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/qpXhjgg/kotorodaxiviz.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/jeruzijelalefamipon.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/cje1rXQ/lego_duplo_world_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/whaGbge/840965013.pdfIn PDF document text
    • http://servisvds.ru/132312977095aohy.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/41db5c78-de32-484e-a94d-181a4f79241f/89551628337.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/egyptian_cotton_fitted_sheets.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_8990c003f55d4546a7e845daf5f657c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a1573b-ffe9-43af-8fe6-96bbb61aa2db/weber_spirit_bbq_3_burner.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/audition_cc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/love_album_songs_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c193708-44e0-4f64-8835-6c7fe31f9915/2001_chevy_1500_radio_wiring_diagram.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_50e0b38de7ea466e8405d8b0e5eb529c.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_dc1f9c6043504113be0d83ecdfc40e96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/347107c6-849b-4a54-8239-061b44293bd2/friedrich_nietzsche_philosophy_about_self.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/amman_remix_cut_songs.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_966299dbc11f48f7a309af30d78a9a65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/fight_club_movie_in_tamilrockers.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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5672 bytes
SHA-256: d92273af7c8883cd20d62a501e6f7b7e63a603359cac60fe68fd6ea8473e7b81
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 11468 bytes
SHA-256: 5d1d6fb02262b18b9710afe4d85777a6919b64a1fa67916cf64e4ab8513d43b3