Malicious PDF — malware analysis report

Static analysis result for SHA-256 a102808b1a491894…

MALICIOUS

PDF

70.9 KB Created: 2020-11-11 05:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 72c4f78c70f40c5566aa766b65aa0dc5 SHA-1: df5287213f4cc1723f13bccb82226fd884bf9434 SHA-256: a102808b1a491894afbb400d92a255de0615b72189e18d4e5fc19d0f424eacf2
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?keyword=the+old+man+and+the+sea+packet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f9f3870b434e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_5f97e6bcbce92.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/jowupukugoka-nozufegepil.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/fepaxidate_fefodogegam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f9b289bee26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5f9f4241e17fe.pdfIn PDF document text
    • https://wibiwiterudek.weebly.com/uploads/1/3/4/3/134373050/3907474.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/fevizox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5faa8254e0cb3.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/bisute/chemical_bonding_worksheet.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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 5416 bytes
SHA-256: 7fcfaaaa32d7d1af70cdbfdec7782c7d0d55c0bae497917e291dd64086cd4afd
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 11264 bytes
SHA-256: 8dc0585b492422b6b67c36d67ac7fcca90b7340db04a5a1f475b36fa754ac66a