Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f490d7cdd96388…

MALICIOUS

PDF

64.6 KB Created: 2021-02-05 20:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4a479480e028fdbae2c1fa7358d3b433 SHA-1: 77821f1e2667bf1730adfec21f22e3bbe3464393 SHA-256: 05f490d7cdd9638838e34b16b3d9b9b4316db2171e9efe8e88a57761f02453f1
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, further supporting this assessment. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=koblenz+cleaning+machine+instruction+manual PDF link annotation
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/2753314.pdfIn PDF document text
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/0eb34160a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxadib.epizy.com/37603328335.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/44242237040.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/girl_scout_law_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/atelier_lydie_suelle_trait_guide.pdfIn PDF document text
    • http://xutarefes.epizy.com/programming_concepts_for_tcs.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/zusimulegijawi.pdfIn PDF document text
    • http://sovagawaz.rf.gd/3023803370.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/job_telephone_interview_questions_and_answers.pdfIn PDF document text
    • http://terezeso.epizy.com/69477764706.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_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 5372 bytes
SHA-256: e543c23429dda199f9c51081800b2af7e4649170ac73d67d72d2dc26bd202996
font_01_sfnt_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 9664 bytes
SHA-256: 63ee1764c3a82d4e1766900c3450f523d6c7f0e8131e8cc0481c0f20f17277a0

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