Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d324b7a592c58…

MALICIOUS

PDF

63.5 KB Created: 2020-11-25 06:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b07975e3d8118a758b6ba9cbb04fbcbe SHA-1: 0c8bd8a06d1a645b85b746345fe927aa0db760c8 SHA-256: 757d324b7a592c585755e7178a57602d3dd65e0e76383133790e6af4bdacc7de
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely as part of a phishing or SEO spam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=business+letter+sent+via+email+format PDF link annotation
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/3385658.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/zutuzifoxe.pdfIn PDF document text
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/lafimekarafud.pdfIn PDF document text
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/5989945.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/petitaw.pdfIn PDF document text
    • https://kisuguwaki.weebly.com/uploads/1/3/4/3/134388310/bemomawumerutas_worez.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/tuwom_titupilum_megigawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5f89c5a7c0e85.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/881676fe-6238-4265-a4c6-2f838b45324d/75796488634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61af252-d0fa-4a39-b076-c5862484c550/lomiz.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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 5020 bytes
SHA-256: 7afc944f079c8c301de0893184c066a6e40ed6d0e007c1c7f7e7f1303f596d8d
font_01_sfnt_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 9568 bytes
SHA-256: 06cf5c1a3d096f148c652798c2a7ef058b085d19b54a29d34f60dc9636d8f2b6

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