Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91a6cee5ffb730b…

MALICIOUS

PDF

67.6 KB Created: 2021-03-29 03:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf4704c4df1696b8e4958e6e8cfa4d0 SHA-1: d585b29027674d954d9ce94b3118360baa364afd SHA-256: c91a6cee5ffb730bf2b59fefac7c617cb71fd6a979309248b29f92031e925863
156 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 generated to appear as search results for specific book titles, a common tactic for SEO link farms. One prominent URL, 'https://midufefew.ru/award?keyword=essentials+of+pathophysiology+3rd+edition+pdf+free', is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=essentials+of+pathophysiology+3rd+edition+pdf+free
    • https://cdn.sqhk.co/jigekuragige/eNhfld4/50777061251.pdf
    • https://xetolakovi.weebly.com/uploads/1/3/4/6/134604046/jasegavaket.pdf
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/tudaxekolikuv.pdf
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/woxolagufolamof-mamezoni-xigadel-nipilip.pdf
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/vojobudosaxu.pdf
    • http://wivevadevenumet.mywebcommunity.org/73605005821.pdf
    • https://cdn.sqhk.co/xeloxilava/itjhPwh/jakewugudobegawesuneki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kubafezin/bicentennial_man_burlington_books.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_ace8270420e645daa4ec4db929e61a8a.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_965de2b15d3d4767b87dfabb22aa35e1.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_32a26021c2d845a48b65f281520509bb.pdf?index=true
    • http://bolirazebaf.myartsonline.com/the_glass_bead_game_audiobook_free.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/derek_lam_size_guide.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_533ee89c724445dca959250e7f3c4f62.pdf?index=true
    • https://s3.amazonaws.com/patotale/gelitotut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cafe.bin
3d209da9e2dd63b786df358db93be5d2b73ee28ce768ec0ddeb407228a0ff8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 5524 bytes
font_01_sfnt_off0000ddd0.bin
7b5a30509a97ca756935e218ec66fe3d6ab7bf3a4cab11158d264212338d1095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10348 bytes

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