Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f82b7b336909b09…

MALICIOUS

PDF

66.8 KB Created: 2020-11-22 16:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6f9e87128e9200e2b627f8e2707ec4 SHA-1: dae9a0875c35070686d320b7686dcaac4d96064a SHA-256: 3f82b7b336909b099047247931b530328c97cac1fb657f6b8247d966da20f927
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, indicative of a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=aomais+go+mini+manual
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8b8517be67d.pdf
    • https://vasegalewi.weebly.com/uploads/1/3/4/5/134595350/tonikeduxibilik.pdf
    • https://joxezikawatunex.weebly.com/uploads/1/3/4/6/134699300/29d65a7626bab1.pdf
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/4202832.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f9926851dc19.pdf
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fa9df8046e22.pdf
    • https://cdn-cms.f-static.net/uploads/4456705/normal_5fa6a86e45ef4.pdf
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/c86badb9c.pdf
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/lawijonefasav_kujakarenu.pdf
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5f9638dbbdd98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rotowan/telecharger_bescherelle_anglais_pour_tous.pdf
    • https://uploads.strikinglycdn.com/files/8a3e07e5-c541-41a5-9985-0941541bd62b/xelisuxike.pdf
    • https://uploads.strikinglycdn.com/files/001b04cd-aba7-4deb-8ef0-26c2fc2fcfc5/83088133971.pdf
    • https://s3.amazonaws.com/sikuva/kikukofurigezolonoduvosa.pdf
    • https://s3.amazonaws.com/titugome/hokanji_temple_japan_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc2d.bin
a871e7e13c173808a99ca0d19a31b3e2389cf8c9d6d2367f56666866ad8a6131
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 4896 bytes
font_01_sfnt_off0000dcc3.bin
860ed7312bfb16df4cfbe41efe12bda147753b865e656150cff028f85d8a0d78
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10056 bytes