Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c91f4f0044a2ee1…

MALICIOUS

PDF

73.4 KB Created: 2020-12-30 23:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef3c8d2d5c4930e49a1ca888b1ecd3fa SHA-1: ef5650919f7dc5fee89b90051492da1ecb0045fd SHA-256: 7c91f4f0044a2ee1e127ba28d8950293163477aa7541a5e5a850daa99e8de100
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, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

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://trafficel.ru/123?utm_term=angelic+blood+pathfinder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fcaf95c97576.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/de3c2601814.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/01cdce6839b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8ec25891d02.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/falodavoxubizene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fabec8099a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fae74dac6758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f8ccebb0c1d6.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/namekaxade.pdfIn PDF document text
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/7889288.pdfIn PDF document text
    • https://jugatevos.weebly.com/uploads/1/3/5/3/135344520/galojol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5feafd88b9d0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/2763901472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ace51d-ae5d-4c7c-b30c-7197106d6aa6/47889264506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9dce55f-3b3a-4403-b1c0-7812f6b3fbe9/british_national_anthem_lyrics.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 5368 bytes
SHA-256: ada0e78a6f7ff76e761867f6f0cab71e283f5096f9b29e1f94b16d153effbf72
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11032 bytes
SHA-256: 1c4b173a47ecea9fb1038416d451a789da4746a7f0bef66fb79691457e5112e9

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