Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b3ef07e6e8f276…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 00:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 732023247e401bd5fedfcd5ee0e25b75 SHA-1: b5256015de831dcf36dc83942b4ba123b222718f SHA-256: 76b3ef07e6e8f276f551600399444e0c89738bf825aa2db9aab45095f953dae7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs leads to a URL that appears to be part of this scheme. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

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://dafemum.ru/award?keyword=bridge+over+troubled+water+lyrics+pdf
    • https://cdn.sqhk.co/dajebala/mjcijgj/1569096450.pdf
    • https://cdn.sqhk.co/wepuvumug/hif0Chg/puwudazule.pdf
    • http://wide-take.top/latin_american_literature_famous_authors6i1yu.pdf
    • https://matatotasewitux.weebly.com/uploads/1/3/1/3/131384286/vemepuragatejiz.pdf
    • https://cdn.sqhk.co/juzosugun/c7vjfgd/evoland_2_walkthrough_mine.pdf
    • http://kamini33.ru/kesilijodexitosakipojutof0h3c.pdf
    • https://cdn.sqhk.co/ragonujip/2rgehdx/rasuwor.pdf
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5ffeb65823761.pdf
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/7974350.pdf
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5fc6f9c5be203.pdf
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/dowotimapirefab-wajovosukorati-fewapimel-dexofejuwa.pdf
    • https://cdn.sqhk.co/toliximozupa/T45Bjcs/kahoot_killer_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://migumirokive.epizy.com/jotul_f500_btu.pdf
    • http://vojapulipono.epizy.com/2011_jeep_wrangler_user_manual.pdf
    • http://bevunogigofijag.rf.gd/medicinal_plants_images_and_information.pdf
    • http://fajesunuk.rf.gd/bibtex_online_report.pdf
    • http://nimuwoke.epizy.com/87301093857.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_off0000e474.bin
98b2ac25e2dabc0c4ec61878a82f4fdaec6ee11d9dd2e0bb9e522349f7f80ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5764 bytes
font_01_sfnt_off0000f845.bin
8eaa2b394f4f594daf8c92e9d848ba3b22075b5c18e4039aadaa49470742529e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10588 bytes