Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd357c84d62fce61…

MALICIOUS

PDF

96.6 KB Created: 2021-03-23 04:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5de9558538ad982b3a5c46a72b443910 SHA-1: e0f60d879dd0f288fd9b9d1166d4054ebf180526 SHA-256: bd357c84d62fce610f2aa184ba902686bff809fef19295da99f97065ad87a028
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to exploit users via external links.

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 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://jacksth.ru/strik?utm_term=humility+andrew+murray+pdf PDF link annotation
    • http://domsale.xyz/body_systems_concept_map_answer_keyf6try.pdfIn PDF document text
    • http://copyright-helps-team.com/kaplan_psiquiatria_11_edicion_gruvug7.pdfIn PDF document text
    • http://freshka.fun/163695744035amo1.pdfIn PDF document text
    • http://susarivusu.22web.org/how_to_connect_ge_universal_remote_to_roku_tv.pdfIn PDF document text
    • http://kumorepo.22web.org/93153287080.pdfIn PDF document text
    • http://santand-es.com/36369272292ajr68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fd0821f53dd6.pdfIn PDF document text
    • http://profer-opt.ru/41721875011kd7g6.pdfIn PDF document text
    • http://ig-mediateam.net/816096782432qonh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_604b850b4327b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fdebcf587271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_6005dd91831f9.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/xavilulus.pdfIn PDF document text
    • https://rebadezoj.weebly.com/uploads/1/3/6/0/136027304/bapefesove.pdfIn PDF document text
    • https://zufikuwokuz.weebly.com/uploads/1/3/4/5/134522796/4325845.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/e827e1b9-9bd6-413a-b04d-7c2605666af6/blackstar_id_core_10_amp_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf002d1b-e3e2-49e4-9da2-18ebb2ba22c5/6691780396.pdfIn PDF document text
    • http://rifasufemufogow.epizy.com/68413070236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29bf0bf-8cbe-4828-9f39-578cc4c88a99/lomiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97db98-5c3a-498f-97f0-c1ac122985ac/dojixoloweput.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_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 5164 bytes
SHA-256: 2c5fb038ae8e168396ac06fbc7133b05abc81b82b95889e873740bad8e4e814c
font_01_sfnt_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 11032 bytes
SHA-256: 3221b78bd5e71300bcdf10c4429ba3cca96f795b88494cfe6f0729ea5ce0bafe

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