Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f31707c03e429d5…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 06:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17b75eb976592daf1e3b4636b26a6474 SHA-1: 295d4d27abd572ee3af5d77ca4508d6c1061cca6 SHA-256: 6f31707c03e429d56c75f190aa9df3e4786e82445f150610d2b352cd37d36dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/wix?keyword=winstrol+cycle+with+testosterone
    • https://nijenemal.weebly.com/uploads/1/3/4/4/134465501/04b4603eec93f71.pdf
    • http://jekeluxuto.mywebcommunity.org/4391958675.pdf
    • https://xevuripef.weebly.com/uploads/1/3/4/0/134098507/03d267371de5834.pdf
    • http://sputnews.com/xewexo75c7l.pdf
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/70eba078.pdf
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/4362173.pdf
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/panozugoxuto-gopaso.pdf
    • https://cdn-cms.f-static.net/uploads/4491445/normal_5fe826dfb19f1.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_604b2caba857b.pdf
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/7e15dd.pdf
    • http://torchqbfl.fun/trivia_crack_questions_and_answers_2018krgrj.pdf
    • https://dofixojibol.weebly.com/uploads/1/3/0/8/130874360/nudesiwe.pdf
    • http://hargotel.xyz/420315302836k28h.pdf
    • http://cz-nitrof.website/folders_report_utilityo8qww.pdf
    • https://taresazafo.weebly.com/uploads/1/3/5/3/135335901/datisepi.pdf
    • https://retujesa.weebly.com/uploads/1/3/4/5/134529196/6518501.pdf
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/vifiwo.pdf
    • http://pevazaw.mypressonline.com/wemosumefujonigosiwoga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/04a3c6ba-1a5a-48d8-82d3-aa2b420e4fb7/first_aid_qa_for_the_usmle_step_1_2019.pdf
    • https://uploads.strikinglycdn.com/files/b8e9905b-df56-4c70-9cbf-b5f33c56c182/is_there_a_new_50_shades_book_coming_out.pdf
    • http://noxukimu.myartsonline.com/symmetry_math_download.pdf
    • https://uploads.strikinglycdn.com/files/a105b4f0-a7f0-4a60-b0cc-d843a087e371/jump_force_character_pass_2.pdf
    • https://uploads.strikinglycdn.com/files/40c73b44-094d-411c-8270-b3c56b2e262f/nafaviruronemesipalisureb.pdf
    • http://kexomun.myartsonline.com/96696209240.pdf
    • http://novupomajanox.atwebpages.com/wadijejogukibogubejav.pdf
    • https://uploads.strikinglycdn.com/files/b0f470db-73a6-4f37-a8d7-3786edec835c/best_fender_mustang_v2_presets.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_off000104fd.bin
a13b975a6f0172b8019378b50e5c16adf1e8a11f3c1fd08447e88ecd82d01a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 4884 bytes
font_01_sfnt_off000115b1.bin
6ffbc662b5161575e0c184a1d030bb6c8f70d54c0d17c83f3ee5255c75eaf83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 10420 bytes

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