Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82e8f4854558b20…

MALICIOUS

PDF

69.8 KB Created: 2020-11-19 06:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 66ec280a5623357c7f7f1e0f8ce8aeca SHA-1: 9d51d7d89c4ddbe3bc7ddd3c8a8d405c2b7a24bc SHA-256: a82e8f4854558b20f24960d0b7a8151029c39ec07aa492807512e6c3740e9a7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://trafftec.ru/strik?utm_term=telepati+yoluyla+aramas%2525C4%2525B1n%2525C4%2525B1+sa%2525C4%25259Flamak PDF link annotation
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/ziginobinotupodisu.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/85631a9.pdfIn PDF document text
    • https://sitiguzesamow.weebly.com/uploads/1/3/4/4/134401829/gojexanez-nodobonol-viweveka-sokoma.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/xaboxumenago_lexurira.pdfIn PDF document text
    • https://numuxubolab.weebly.com/uploads/1/3/4/3/134382028/a2a94c43.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/fbc2796b057.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/4117077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zaxuledo/karpal_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/34786685826.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/copper_penny_tile_sheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 5224 bytes
SHA-256: f176f053aaff715a219521fd40b8343d94aca79313b148591c610e9f83a87362
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 11796 bytes
SHA-256: 30e05e7cddcdfc751d2fe5192bb93c05bc4fb25a985207104820063639aae762
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34