Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ed683fd89e7bb9…

MALICIOUS

PDF

84.8 KB Created: 2020-11-10 18:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5ec666ed7072595c7002d46ca13f6373 SHA-1: 7abd023792c96d550771f18a659ac289257628a5 SHA-256: d6ed683fd89e7bb9000eb8c994f3a17172101a63c022ebece1842e02eafca888
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure point towards an attempt to manipulate search engine rankings or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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://trafffi.ru/aws?keyword=tria+laser+instruction+manual PDF link annotation
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/6667606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f890aace2f29.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/xivutimumarumanede.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/9ac5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f9c8cbf278f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f97c645ad359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5f99648eeaffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_5fa48e62ad328.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9859961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f8aab9169363.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/munov-kilagoz-bebokanida-buwaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_5f974b609f979.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/vokeri/noc_letter_format_for_bank_loan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ac6483-e58e-47b9-aa09-0847e4def781/vocabulary_workshop_level_f_unit_4_a.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_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 4896 bytes
SHA-256: b677d591fe7bb4f28844936831cea85245143df08ba76ce667ce37da711ab4e7
font_01_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 11132 bytes
SHA-256: b06774c3d8a319a979f937903b77bbe7f9dbb04b0ee446847c817a595c2e4b14

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