Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f7f35e969ed30b…

MALICIOUS

PDF

67.7 KB Created: 2020-11-11 06:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d1075337684bc5f4fdde389a3b27082b SHA-1: 5d09b2bd154af54481946a15a94e7b49914ddcaa SHA-256: a9f7f35e969ed30b8ad3ed97800278c5537ea58d6a02594dedc2dac3f29125ea
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?keyword=broward+county+calendar+2020-21 PDF link annotation
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/cf0f33cd8.pdfIn PDF document text
    • https://galojegada.weebly.com/uploads/1/3/4/3/134364802/rikijutizixaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5f93ccf1f3ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5faa4a5946dbb.pdfIn PDF document text
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/xagimavozefakukew.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/setobijeludome_furako_gapoded.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/susopuzupure/95219422088.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/frightful_first_world_war.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/cloth_id_in_unturned.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/que_es_psicologia_industrial.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/los_angeles_times_newspaper.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_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 5356 bytes
SHA-256: 0e2e4ccf51d39403c40586960e2dd4e04f4f84bf84235d18c42093453561dd91
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 11420 bytes
SHA-256: 805095a0cfbef9a3aa1271f327ca4f9388c475213fb34e17dbc6fe1dd5474a0d