Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a36bc06df966b5…

MALICIOUS

PDF

89.6 KB Created: 2021-04-01 17:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e8ebf573ec20a3bbd20eab41e4370b24 SHA-1: 9a48cfbbd57523921729b9dd8cf01db8bd42b898 SHA-256: 10a36bc06df966b54c061e8ca5219a6ecf43e59ceb090c3649a139480d3a691e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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://jumiwimov.ru/award?keyword=acetato+de+medroxiprogesterona+bula+pdf PDF link annotation
    • https://cdn.sqhk.co/movozuba/gJtVdgc/fimezekaboretiduvadafutuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/ijgg3he/64264864266.pdfIn PDF document text
    • http://montana-media.com/67098107042lucny.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/b2jfwCP/49160936048.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/e7e40ee580b70.pdfIn PDF document text
    • https://cdn.sqhk.co/naxopesareg/gjggjmn/5931145459.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/bjhgget/4337982309.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/fhbiigg/brick_breaker_game_with_ball_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/njdhj8H/men_s_casual_button_down_shirts_untucked.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/fowosofazadu-zaxididedopaku.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/brje8h6/18429102366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/cardinal_numbers_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/sokepinugeva.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/free_monthly_household_budget_worksheet_excel.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_a145d72b49b54280b2650257abc3df8f.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_537e34f61a8f4b74be874ac643c0e744.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_4894337251544a0db1c448cd144512df.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_684e28b367274bb8b153d711a0794ae9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/grand_daddy_purple_grow_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 5672 bytes
SHA-256: f1b2232c809ad3d0c82a4a2a7b542d9ebf27d9ce83bf4d6aed6f1307881ae84e
font_01_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 14816 bytes
SHA-256: b111ba4f6e2165083b5b082f7b576ca3f21f35b112102a6e274699463e20b195

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