Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7875113966f3d40…

MALICIOUS

PDF

81.8 KB Created: 2021-05-05 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d8756c38ac69ab315a86d258e7389ad7 SHA-1: bc8916cfd936daba3e087d4602e23787f98274c6 SHA-256: b7875113966f3d40bbc645f829c560dd34b9ab0248cc357b882210d62c858912
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/strik?utm_term=25000+usd+into+cad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369493/normal_601fab0127011.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/nusupexuked.pdfIn PDF document text
    • https://fugogifozu.weebly.com/uploads/1/3/4/8/134888696/1401207.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/bonogugogn7k3.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/woxebobamujunixalewi.pdfIn PDF document text
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/220271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_602ecc7b28e39.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/roxogikofanaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_600e97789b4f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_606dd8c5a115a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd3084329ad4.pdfIn PDF document text
    • https://vebipebetas.weebly.com/uploads/1/3/4/0/134012388/9394264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fdc4b94989a9.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/printable_monthly_calendar_2020.pdfIn PDF document text
    • http://lawyer-consult.ru/dometic_marine_ac_repairl53un.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_600fcb4937174.pdfIn PDF document text
    • http://qwonder.space/hamilton_spectator_crime_reporters3sm9l.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/welanisowari/mazda_cx_5_carsguide_review.pdfIn PDF document text
    • http://pigutun.myartsonline.com/lower_back_pain_exercises_aaos.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/photogrammetry_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/komovomemisejul.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/dopevumotajitobumalagil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 5108 bytes
SHA-256: 707b10b9eadfc318eff1be49a12cd614027ccb54f7f3d444b71cfb070634a2fd
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 4740 bytes
SHA-256: 842e1d7af7bc0802c1128b7dc4b49c6a758cd5c160456ee6941da14e12226eda
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 11900 bytes
SHA-256: 312986c8ebbe57cb39a7135de8967e3d0a721bcbe19451dcada2a6b9c2b82793