Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1c161e4bae867…

MALICIOUS

PDF

86.4 KB Created: 2021-03-06 10:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f346b61755efb15a3dd19a48c1eaab SHA-1: ec8ca26034fb3a76bb6bb1d16c4b01375a33393c SHA-256: 33a1c161e4bae86719e327131a06dcc77ba75e8e1236f7eeeb15f08ba1f6cea6
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 are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ponafet.ru/123?utm_term=why+isn%2527t+my+shark+vacuum+spinning
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fd62fc8bdabe.pdf
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/benoj.pdf
    • https://cdn.sqhk.co/ravuviwidi/ie7ifhj/crazy_bowl_free_shipping_code.pdf
    • https://cdn.sqhk.co/jaxabofapuw/ciegdig/zombie_assault_game_3d_shooting_games_offline_pc.pdf
    • https://cdn.sqhk.co/faresawuf/FjfshbG/fire_tower_colorado.pdf
    • https://cdn.sqhk.co/salobosemiv/giMjbgc/free-_litecoin_android_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4409602/normal_60181bbc34af6.pdf
    • https://cdn-cms.f-static.net/uploads/4382190/normal_601004cd00e70.pdf
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5fc6a3d079cf7.pdf
    • https://cdn.sqhk.co/migefareg/hgfhady/entrepreneurship_development_ebook_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fec96f97ca02.pdf
    • https://guridawado.weebly.com/uploads/1/3/4/5/134578433/livobebokope.pdf
    • https://static.s123-cdn-static.com/uploads/4479715/normal_6003a6f9a4069.pdf
    • https://cdn-cms.f-static.net/uploads/4416502/normal_6041a9caa5235.pdf
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/2b548ad7fc594.pdf
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fc6c38b5f40c.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/pigoliguwujosadido.pdf
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fda90866428f.pdf
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/2970149.pdf
    • https://jipenudus.weebly.com/uploads/1/3/1/4/131406532/vowiwexazukegi.pdf
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/nobad-vedafun.pdf
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fed739530ee7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_9ebef00bb3444e2abac7e75b8e83de8d.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f013cc9f5dc5486d9b98922436027da4.pdf?index=true
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_d51eb427d2a14e5797cdbf7cbf07e674.pdf?index=true
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_8911562889914609942b99e3794713ae.pdf?index=true
    • 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_off000114d2.bin
ddb92c6e4a909a1c2e906f4de35b2fde2204afffd2b5f4c9bd5099099ca0b0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 5588 bytes
font_01_sfnt_off000127c7.bin
efd415e44c986d807d2d6f2d27981b374691dbed7882e6761107ae3f6410e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 11040 bytes

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