Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc06f3c2ab965915…

MALICIOUS

PDF

63.5 KB Created: 2020-12-11 21:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ab66dc6bd3f928c4a024848c75943c SHA-1: 78acf9d5c6a963a29bb5d4d6ed6746bc04902337 SHA-256: bc06f3c2ab965915653fd777373e7d7cf031ebf0fad148cc049002ff0f070762
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafffi.ru/123?utm_term=mobile+pet+vac+anderson+sc', and a linked PDF from 'https://bufezemaz.weebly.com/' are suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', 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://trafffi.ru/123?utm_term=mobile+pet+vac+anderson+sc
    • https://bufezemaz.weebly.com/uploads/1/3/4/7/134714495/lidebudodumisejok.pdf
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5fa80cd87fe2a.pdf
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f8f1ec88d3d7.pdf
    • https://cdn-cms.f-static.net/uploads/4410206/normal_5fc14d3aacd41.pdf
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fd03d5e8cb15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35fbe961-8e50-4c05-a1cb-2e41b5e431e2/properties_of_ocean_water.pdf
    • https://static1.squarespace.com/static/5fc6b2965bcb0228a2ab1122/t/5fced0485c8977691e2a46a4/1607389260482/sirris_summon_sign_dragonslayer_armour.pdf
    • https://static1.squarespace.com/static/5fc00a03c6229360eca839ab/t/5fc3eaa73c6ccf69f3d756a8/1606675112496/how_many_king_of_spades_in_a_deck_of_cards.pdf
    • https://static1.squarespace.com/static/5fc0fd9af9866f3fd2d4d777/t/5fc193909b1ed0353817b833/1606521749068/lazetow.pdf
    • https://uploads.strikinglycdn.com/files/d76b6193-b4cf-4157-a116-fcb2e62e410a/81399226591.pdf
    • https://uploads.strikinglycdn.com/files/86b26c64-939a-486d-8fab-d8dce2be35ae/1277481215.pdf
    • https://uploads.strikinglycdn.com/files/1d3cf39a-98fd-424e-a637-ee2880991481/apostila_de_matematica_para_vestibular.pdf
    • https://static1.squarespace.com/static/5fc3d3f7084698658e709650/t/5fd037e43364176a1254cf4b/1607481316609/love_story_books_for_young_adults.pdf
    • https://uploads.strikinglycdn.com/files/9d744658-a6ee-48c7-9cc4-a132462f26a3/kobifizefarigapud.pdf
    • https://uploads.strikinglycdn.com/files/0748301b-5b33-4ce8-84ba-1b4eee6f0904/wesapij.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_off0000bab8.bin
1c90e7a331f7799a17dc72e7ca9a9f5b22fa8d8ba60c26560fa5e819fbcb312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 5272 bytes
font_01_sfnt_off0000ccbb.bin
1e954fa79ed7301c8967b4fba33cfea1434df214fa19d5505075547e36a6b8d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 10812 bytes

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