Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe84c47e84b64d1…

MALICIOUS

PDF

80.1 KB Created: 2020-11-25 05:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf18b3d76bf936e4a4fa8ff366018b7c SHA-1: 5421daf49b1bcc6d6cebb6d7d8fcded04d1b0a62 SHA-256: fbe84c47e84b64d1d9cc446698946a2646b9011efe2a36b13348256a73c0facd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL pointing to a potential phishing or malware distribution site. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://traffset.ru/strik?utm_term=triangle+math+and+science+academy+apex
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/32eda364.pdf
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8813269a378.pdf
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/3400541.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/vupuxaxawoxelap-nafaxujes.pdf
    • https://dejigusadimegog.weebly.com/uploads/1/3/4/3/134324817/misavifujerasupibo.pdf
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/008b655899195.pdf
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/3b90c2.pdf
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/bf0f87f7262c.pdf
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/6995052.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fb7f5e42a2d4.pdf
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/4422357.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/zokuzunuv_vujemepojetine_vakatepinefi.pdf
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/c8918cee8884.pdf
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fa0b86b0389f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagoba/spring_framework_generation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c1d.bin
5951813ca15461ea002c9ed0a9084fe4cdbff95cd6dab60f7aae948afffc99db		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C1D 11444 bytes
font_00_sfnt_off0000f929.bin
3e40b0bc5aeafdc03214165147e5a7fd53cb2cd0485dc66a725b4394e745ade7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 5608 bytes

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