Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e0a5bffc4bb04f…

MALICIOUS

PDF

65.3 KB Created: 2020-12-09 22:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a0d87318b424a916203b4a1bdf859f77 SHA-1: d951447b1efc884ae1da9a25e04e4cdd34d1e5fa SHA-256: 87e0a5bffc4bb04f514e7bb6b7fc566263c682040f8413cfedc6dae6b87b7f66
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the document strongly suggest an attempt to redirect users to malicious content.

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
  • 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://trafffe.ru/strik?utm_term=jasmine+acoustic+guitar+price PDF link annotation
    • https://tumupapixukuju.weebly.com/uploads/1/3/4/8/134852222/venob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5f91dcbd042d1.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/211ceca.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/24c899fb636e.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/libor.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/dusar.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/1657902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5fa5e08c1bef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5fa4cc3c9fc38.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/7822071.pdfIn PDF document text
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/litederozerevodisixa.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/pulujolatepuv/86566578818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff76c881-410d-412a-bd8c-bf33400815ef/error_code_0xc00000e9_windows_10_fix.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_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 5208 bytes
SHA-256: eb9928e852d11ee699d0e0815f8841ee8317a105725171d5243ae67ace8799da
font_01_sfnt_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 10468 bytes
SHA-256: cf6a211514920b050f8b8e846fec88e56e63dd15f5cae551adbe45df395f6594

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