Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6631992a081989…

MALICIOUS

PDF

115.2 KB Created: 2021-02-22 10:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 025455a8d982db01814cf1c266baae57 SHA-1: 0b7fb5324610045a00eb9e9a66a483bb16caa4b7 SHA-256: fc6631992a0819894b6517123f2bc49acb59993205424b06fd3400f5f3808577
186 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

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://druttle.ru/123?utm_term=classical+guitar+strings+nylon+vs+carbon PDF link annotation
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/7522834.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/jamujapatiler_boberipolofadox_marariluso_zojoxogesoveva.pdfIn PDF document text
    • http://file-id.ru/amona_tete_mabo_free3kod0.pdfIn PDF document text
    • http://policyhelpcenter.com/footprints_without_feet_extra_question_answer_edumantraxhaka.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/a41cb00.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/botobezerovubuj.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/f0bddfe1fe9787c.pdfIn PDF document text
    • https://foxuveguba.weebly.com/uploads/1/3/5/2/135297813/fusojosugazuf.pdfIn PDF document text
    • http://interstart.online/pebutijebonakm1zox.pdfIn PDF document text
    • http://adv-workshop.site/sons_and_lovers_theme_analysisdgmnd.pdfIn PDF document text
    • http://stal-kemerovo.ru/83316292915m77xy.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/sisedofatawipor.pdfIn PDF document text
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/nolasogakixow.pdfIn PDF document text
    • http://storezone.info/10th_class_math_solution_arts_groupizt0y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000182c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C8 5176 bytes
SHA-256: ff2e70b564c4531e1c7dd7b216f2efcf1e7226e1f6e949e229f1e83014f70a9b
font_01_sfnt_off0001947b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1947B 14176 bytes
SHA-256: c1bc9bb6c85e651d24859b3535f19acd8408592c0c3a9967730604c93e886b11

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