Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ffd2b523f5c2a6…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 08:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 484aff1324aade954337ecc1bbebbf52 SHA-1: 3340fc7d75fc9980f004b611e385aba211be0fe4 SHA-256: 20ffd2b523f5c2a630e7d615448d007dfb91ce1489ce60e34302aa48a232046a
202 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/strik?utm_term=schweser+promo+code+2020 PDF link annotation
    • http://kogowetek.getenjoyment.net/fish_farming_business_plan_in_india.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/2234490.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/d90c77bd.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/6623570.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/2be3eeb21f3b.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/f7462c4d74.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/3Iyjijh/77986046560.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/gcuBzia/64313347008.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/1091865.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/cellular_humoral_immunity.pdfIn PDF document text
    • https://pebogifi.weebly.com/uploads/1/3/1/4/131438694/2215575.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/sisaxu/mumeg.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/tnpsc_agricultural_officer_exam_study_material_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/what_does_a_neuropsychological_evaluation_tell_you.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/german_food_guide_pyramid.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5540 bytes
SHA-256: e366bc50fd205c4921daf56e9896301f832d0698d1e60fbcec2bb673aee79fce
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 11144 bytes
SHA-256: 15827785c4f3f17783c39e735162337f2a258ac9d72446f6308a520ad93aa8fd

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