Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0aef8ad319b6b…

MALICIOUS

PDF

74.1 KB Created: 2021-01-26 11:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cb45d7936df2a919faac3e8c3f40c533 SHA-1: 2d3f084d176741ae3d00247d7dac63d45b199149 SHA-256: 59a0aef8ad319b6bfbab4313cbb8fa744e531440c48bb5ed91259a98ca31eca8
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, presenting itself as a 'redundancy letter template' to deceive users. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafftec.ru/aws?utm_term=redundancy+letter+template+employer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494440/normal_5fe2163b8cac5.pdfIn PDF document text
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/c8387768ec1.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/makoxawata_jagunoza_loxizanapulud.pdfIn PDF document text
    • http://pitushok.space/fufuluvitcf9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_600a4ac897398.pdfIn PDF document text
    • http://mybestchan.online/120215317336opts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_600e4423816db.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/wepajepaliriv-wufumikafalo-xisagewi.pdfIn PDF document text
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/6808.pdfIn PDF document text
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/seronafikifo.pdfIn PDF document text
    • http://tehnotop.store/vogoxusalomolucd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_60045a110b65f.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/6149613952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5fef9723b72a7.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/ralosiwu_topavedixujawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5ffbc49c5589e.pdfIn PDF document text
    • http://fruittea.space/singing_in_the_rain_gift_ideasgmyeq.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/rokuwapesu/72272063740.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5152 bytes
SHA-256: ef8182104e074545dba4c83e8f71e16a71df24160e84ffb906be816f4a75ca06
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10944 bytes
SHA-256: 49f16c7c32b0ee24310f4e9ba3b3cb6008182d7d0bf29a0ad7d41523b3959c53

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