Malicious PDF — malware analysis report

Static analysis result for SHA-256 191ed5f5c108f086…

MALICIOUS

PDF

62.8 KB Created: 2020-12-25 01:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c6344fbb08fb38e865677bfdbd84011 SHA-1: 9239cfecff668269e73f6becfc261ea32882b8ec SHA-256: 191ed5f5c108f0860e18566e9c62ffba1d9193522e0041096d7601c4509db729
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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/aws?utm_term=bhojpuri+bhakti+gana++video+main PDF link annotation
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/numenifevuvofa.pdfIn PDF document text
    • https://kizofupotumi.weebly.com/uploads/1/3/4/3/134314367/vozuzudukitag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_5fb89fa075a1a.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/8727dfdde7.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/7125160.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/molugi.pdfIn PDF document text
    • https://cdn.sqhk.co/vadafepagij/gejafX3/gang_battle_simulator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5fbe262f69e0a.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/4351539.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/nudijepa-bamakegikobix-pisedetabem-fugosuxebikaf.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/dd287ee1-7feb-473a-81b0-5190928ddaeb/wafebe.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/32401800710.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/chico_science_e_nao_zumbi_afrociberdelia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ad6d76-5693-4447-bee4-e9399d685288/20648179397.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_off0000b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 5552 bytes
SHA-256: 5c7eec64a0bdb9dbd264e0d35c987db69d3ee2aa7a0f5b4ed2ea64dc28e7c3f3
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 10484 bytes
SHA-256: 78c885eaadb77d66fa03dcac81c51640966de936bdd699051f5bef386b41aad6