Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42001897cb39e3b…

MALICIOUS

PDF

65.8 KB Created: 2021-01-11 10:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 13dcf90dcddc9e8065125a3bcac84aef SHA-1: dee1096e7cc2d87406f3a7fbe05eb3a6411b54db SHA-256: f42001897cb39e3b9064c57e58f76f26fc92f33485cebec38ca84730e34bc4b7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to 'trafffe.ru', indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffe.ru/aws?utm_term=aftershokz+air+user+guide PDF link annotation
    • https://site-1168018.mozfiles.com/files/1168018/mgvcl_electricity_bill_check_gujarat.pdfIn PDF document text
    • https://site-1201024.mozfiles.com/files/1201024/venepukasas.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/ielts_4000_academic_word_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/dX1Dgfe/solano_supersolano_3500_lite_hair_dryer.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/7icifFv/rezozarovatod.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/79460943116.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/java_1__8__0_202.pdfIn PDF document text
    • https://site-1175739.mozfiles.com/files/1175739/samsung_note_10_windows_integration.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/1777807.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/satulibaren/aligarh_muslim_university_online_admission_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/gavufe.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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 5016 bytes
SHA-256: c9ac99f59cfbde9ef461725dae4b7065e77b3dd7785c3ddef73dadc9dc1828c8
font_01_sfnt_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 11060 bytes
SHA-256: d5080de0d3c2706daa4d93cd7950dc4393ceeb7c00face74ae2251af0dd7572e
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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