Malicious PDF — malware analysis report

Static analysis result for SHA-256 8757b827857cc2ac…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 10:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd29b6ff333bb60c2a3464646f326385 SHA-1: 5e9e55537df2f373608ab1fadfdb95ee7440924c SHA-256: 8757b827857cc2aceb3b81682323a4a86b992cffd1c79fc22e9f3489213e50b3
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, directing users to external URLs like https://lozipotod.ru/strik?utm_term=line+6+pod+hd+300+patches. The PDF structure and embedded URLs suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=line+6+pod+hd+300+patches PDF link annotation
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/xazivu_dapekur.pdfIn PDF document text
    • http://supportcopyright.net/practice_worksheet_of_preposition_for_class_3y3qbu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_6002d618908fe.pdfIn PDF document text
    • https://sokikafumuwo.weebly.com/uploads/1/3/4/6/134697409/1874775.pdfIn PDF document text
    • http://nout-prokat.website/asrock_n68-s3_ucc____wbqh3w.pdfIn PDF document text
    • http://bit-ipo.ru/jonuxelabusoviwuiid34.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/caso_6_de_factorizacion_ejercicios_resueltos_algebra_de_baldor.pdfIn PDF document text
    • http://tovelksa.website/calculator_app_javabav72.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/nofagipibegu.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/tedowafomaru/endometriosis_pain_treatment_guidelines.pdfIn PDF document text
    • http://dinijeti.rf.gd/17927113728.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/instagram_dark_mode_not_working_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/riwisofuzuvadozow.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_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 5432 bytes
SHA-256: 3f5a29999a6b7b92a9722db2ddb66b17fa9c2d55ab803ec48db7408fa48852d5
font_01_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 10976 bytes
SHA-256: 427aebd48d78f5516d2891494bda72e61a5d09964e5d41e6e5dd78679544da20

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