Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9e9c55be50bc9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 07:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ecd336829cb9878e3801944bd1f0f2 SHA-1: c51e8fd027f7ae9caf964b1a8b6e014ac2f1f537 SHA-256: b8f9e9c55be50bc9e4d8732429bdc8fef3a5ca96118aa9a68b276e286a1aca35
226 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are invisible and point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9667

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://leonvi.ru/award?keyword=german+reading+books+for+beginners+pdf
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/d6aa7.pdf
    • http://nutristrike-shop.ru/3080351218uhwld.pdf
    • https://sijawakupud.weebly.com/uploads/1/3/0/7/130740213/9cb739b3b.pdf
    • https://disemiseses.weebly.com/uploads/1/3/1/4/131407045/76c0a98ce39.pdf
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/fawemojirejemana.pdf
    • http://duwinijuj.mypressonline.com/isoniazida_efectos_adversos.pdf
    • https://cdn.sqhk.co/wafasojudo/S425Tjf/homeschool_pop_florida.pdf
    • http://tetiviguxawik.getenjoyment.net/36150122814.pdf
    • https://cdn.sqhk.co/rufosopufu/ZibJljg/52544553133.pdf
    • https://cdn.sqhk.co/xalurubizud/AZ0jjdE/nibamelivavivimaxixiwigo.pdf
    • http://xtw2.club/7257211302487mjj.pdf
    • https://cdn.sqhk.co/tanusulirava/fxgdijs/patrick_star_falling_gif.pdf
    • http://ontrade.top/java_interview_questions_and_answers_for_freshers_javatpointd27v6.pdf
    • http://xipodijajul.sportsontheweb.net/92475786694.pdf
    • https://tatuwimo.weebly.com/uploads/1/3/4/8/134882860/figama_gekexajerigapur_fogipowimur.pdf
    • http://fherixq.com/povebinolefif2bcac.pdf
    • http://managerprogram.live/27110501960hl36p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc4a60d8-690a-45a0-b66d-4bffddada026/inferno_dan_brown_movie.pdf
    • http://xejobutek.onlinewebshop.net/orioles_schedule_2020.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_e797890b5ee944f7b6f488c3b5723c4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5945f899-bd8e-4d0c-baf2-cdbdb489d3f5/lights_out_imdb_2011.pdf
    • https://uploads.strikinglycdn.com/files/c39681e4-5f75-43ed-a069-def4fe7b8589/jeladibaxadesewedimo.pdf
    • https://uploads.strikinglycdn.com/files/270c0fc9-6b01-4289-bb4b-b46f5603508d/mewurowunilinegeko.pdf
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_2955c31c03ef4550a4629ee07136ed68.pdf?index=true
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_612a6f8497eb482ba035bbdcffa4407c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e5db2bb-11c6-4c69-b10d-50ca57fb0267/bose_universal_remote_control_user_guide.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_e81d432a61d34439be75c3900531ca02.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f663.bin
57b2bcdfeec62bb07af2c9d9d2683e334d9684a0a3ea4cfc9ab5a45fff2b8259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5564 bytes
font_01_sfnt_off0001093c.bin
a0856c63b232a39eebc72bea48493bc2d517fccb0411f2e57fb4b3ef022465b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10604 bytes

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