Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab33af95a1331e8…

MALICIOUS

PDF

69.0 KB Created: 2020-11-25 06:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e155b75c876602b5fdf5540fa560cf8d SHA-1: d133e04b1ba5a8025c8a336303b1a04cc8e88b41 SHA-256: 1ab33af95a1331e8f747a870fc4361b1a7649fb55337e921b6de52472a475084
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs likely serve as initial landing pages for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=scatter+plot+and+correlation+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5fa1016da7afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_5fa522673274d.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/popudofofuwib-mupemufi.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/goxitebukizalo_zuwogirixugubu.pdfIn PDF document text
    • https://xovaxavirot.weebly.com/uploads/1/3/4/8/134853903/cc1bc812b1ea.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • https://tatilimaju.weebly.com/uploads/1/3/4/4/134464449/ce09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5fa5e87d7289a.pdfIn PDF document text
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/4342891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3b580bd1-5a44-49e6-a8e5-bc63e642f87e/kaxogivajelitewaworefefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a23d91-8c69-46a4-8278-c77e0f989700/vixikowurunoxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ff296f-e4f9-4d1a-866f-f925f36ce2f1/vijupigetum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 5208 bytes
SHA-256: 1bf84d51a7e99b4682c48f09b8c4782989587d8cf9d02cdd0f33243923ffde1e
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 9780 bytes
SHA-256: ebf7acfdc46ed043968ec6deefa5fff91182d3761058173ecede3eaab9e1cfa6
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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