Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a52ce23617800…

MALICIOUS

PDF

121.4 KB Created: 2020-11-18 09:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04d20608da0ab6b4c720cf4195ec4118 SHA-1: 3371e6c5408f2f627842e7384e290a004251c116 SHA-256: 1b2a52ce23617800457fdc0c025466fdcafcf22c5a633a739de956b1df233ba2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafffi.ru/123?utm_term=pierce+brown+dark+age', is particularly suspicious and likely serves as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffi.ru/123?utm_term=pierce+brown+dark+age PDF link annotation
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/tujanozi.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/durusuwut-kufagiremofos.pdfIn PDF document text
    • https://rirubonoji.weebly.com/uploads/1/3/4/5/134528367/f5bb8330d077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5fb49eb31ff9b.pdfIn PDF document text
    • https://rewazuxaroro.weebly.com/uploads/1/3/4/3/134341361/gozavelodokuwom-larelamatop.pdfIn PDF document text
    • https://puxedeva.weebly.com/uploads/1/3/4/7/134730870/8268268.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/31333f6e594a.pdfIn PDF document text
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/sakizu.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/edf23ec2-fc70-4a47-92f7-9cadd0c1d7e5/trainz_driver_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/horse_commands_gee_haw.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/61198656540.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bomanomabepagakujijired.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_off00019776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19776 5196 bytes
SHA-256: e7cce034be99a4309ed122944d106d201414b5b4e9817924c2f503cbde16e310
font_01_sfnt_off0001a93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A93E 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0001b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1CE 11380 bytes
SHA-256: 77fe06dcaeeb5120118805af1ae49621fc6f1de9f6d1e0484e80ba164f354d93

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