Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7b4e2e6e7f546f…

MALICIOUS

PDF

74.6 KB Created: 2020-11-24 00:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fb9ed979fca89c177a1d21e3a23ec0ad SHA-1: 17b2f48a49b9414e819857aeb61d761102c8d158 SHA-256: 9e7b4e2e6e7f546fbe66672495228a9fe2d4f1d4a6250e7be291e67dadec287a
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The document contains numerous embedded URLs pointing to disposable hosting services and a known malicious redirector, suggesting an attempt to obscure the final malicious destination. The presence of a link farm indicates a tactic to distribute malicious links across multiple domains, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=nc+property+and+casualty+insurance+study+guide+pdf In PDF document text
    • https://fegixobipe.weebly.com/uploads/1/3/4/4/134467450/foviwek.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/1705118.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/pekijadamudi.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/7374955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f97fb62af77b.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/70948f7bff26.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gexenop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_5fa4941f120c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5f963bc6bedcd.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/247402fb-cda4-47e2-9353-c48323336aa8/ripuvarefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b63a7a-c36f-4145-891b-f18ea56f70ac/1848482821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9411881-be82-4a05-bcf3-670ca21238bd/74381821068.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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 5276 bytes
SHA-256: 1100511c32424b9246fc1c5c2206ff8aa47a41220ca5b1b90a712b3de97a9269
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 10720 bytes
SHA-256: bf936f0e2f7e11974434e0c3b62912f0c5b37253fcd6ea1cb3ed4808f1953f02
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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