Malicious PDF — malware analysis report

Static analysis result for SHA-256 db40603279a76f90…

MALICIOUS

PDF

74.0 KB Created: 2021-06-06 05:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 11188651e86dfde9e591ec8df07fe89e SHA-1: 699c4105291b1debd422dbe1ef85e317241abe8f SHA-256: db40603279a76f904dae0eaa014ee9da5baef3284498616d3018e5c873606af0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to weight gain, directing users to URLs like 'https://nomylo.ru/pbw?utm_term=how+to+gain+weight+and+muscle+fast+for+skinny+guys'. The presence of embedded URLs and the nature of the link farm indicate a likely phishing or scam attempt.

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://nomylo.ru/pbw?utm_term=how+to+gain+weight+and+muscle+fast+for+skinny+guys PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409246/normal_600a5137a3b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_6047232245c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60bbe2d7afa0a.pdfIn PDF document text
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/4376584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_5fd2947099d12.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/pawusafet_xadoguk_ledanefetepulen_biwamon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_601dff27ae4b9.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/kaviviboxutomez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fda8d52943bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_603a296588bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fdd36d4e4e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_604983d5f09b0.pdfIn PDF document text
    • https://ratamugokamilel.weebly.com/uploads/1/3/5/9/135959592/nutimabow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_601834716a4fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a924fe-0597-4e56-a046-20189b68a339/fovadanowolaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8152729f-b48a-4e22-b470-a0e6703cda39/83685929668.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144471744/kafovewuxoderejoxagotebew.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/53303877371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c485380-cc81-4b27-ae8a-3d98bb6c20eb/hoover_windtunnel_v2_belt_replacement.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_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 5652 bytes
SHA-256: 8ce8ecc9a7ddd54a69506ea8141dc799da7895bd40a3d90cf1351c7e9772dcee
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10556 bytes
SHA-256: 5bc5e70625d10d12ad4cb3bc3a85483b21226fd85f6a2ffe9385253653e472f1