Malicious PDF — malware analysis report

Static analysis result for SHA-256 e348788b4a3362bb…

MALICIOUS

PDF

85.9 KB Created: 2021-06-01 14:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44bf606dc803efdd5457022f2a3b52eb SHA-1: 778727678ab15d1afe29b1b88ad22fe3a6349944 SHA-256: e348788b4a3362bb169ab68159636b2fe27ff84df061b87c73139d05e12cb62f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a vehicle owner's manual, directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/pbw?utm_term=2017+bmw+4+series+gran+coupe+owners+manual
    • https://cdn-cms.f-static.net/uploads/4386842/normal_600d0efde7df1.pdf
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/nudoliwefejinisu.pdf
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/xibenes_mipitoxubipuvi.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/tiliruk.pdf
    • https://cdn-cms.f-static.net/uploads/4392656/normal_605fd994d1e72.pdf
    • https://cdn-cms.f-static.net/uploads/4454671/normal_601b7c24bf315.pdf
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/xalewuzen.pdf
    • https://static.s123-cdn-static.com/uploads/4463543/normal_600004cf819a6.pdf
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fc892ff26131.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_605bc3c14a37e.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_5fe7ab4c920ce.pdf
    • https://cdn-cms.f-static.net/uploads/4502188/normal_60488cde7737e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b23ffce4-451e-45fc-ab96-5e6b735896f2/85294704942.pdf
    • https://uploads.strikinglycdn.com/files/2056a9f5-d0ed-4d2d-b517-782d4227c14c/tu_mundo_empanadas_allentown.pdf
    • https://uploads.strikinglycdn.com/files/152ecc70-5269-4462-802c-542cdb428b86/1698919420.pdf
    • http://rujuboxu.pbworks.com/w/file/fetch/144457416/formal_and_informal_email_writing_examples.pdf
    • https://uploads.strikinglycdn.com/files/fe449cf4-0073-47d8-af03-8a4f0ef0cfc9/xesivodimola.pdf
    • https://uploads.strikinglycdn.com/files/ca9c9c7a-7f35-4ea9-8af9-2cf481d579bd/how_do_i_learn_to_repair_electronics.pdf
    • https://uploads.strikinglycdn.com/files/59da0910-c9ec-4011-90fd-1040dbba7baa/how_to_replace_ice_maker_in_whirlpool_side-by-side_refrigerator.pdf
    • https://uploads.strikinglycdn.com/files/a1544275-ed67-4939-b213-4882854c0e66/15204307386.pdf
    • https://uploads.strikinglycdn.com/files/a8af30ad-b8e3-4507-b9e9-602858091c4f/the_missing_season_2_storyline.pdf
    • http://mosijiv.pbworks.com/w/file/fetch/144424395/59086096726.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_off00010d6e.bin
9a2ab27585cf91523ec8151db23da88ec754f36f07595d741b9343e869ff84a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 5884 bytes
font_01_sfnt_off0001217e.bin
a0ef7f83d5455d47b9322337ac1a4daa1c9c0e12450d4a55c1341ec025644e47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 11472 bytes