Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea4c6cecc2398ed…

MALICIOUS

PDF

83.3 KB Created: 2021-04-16 22:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a506e4c580eb21200a9ac9e4541146b7 SHA-1: 51aec95e264e21e41902398c587a2ed564b53afa SHA-256: fea4c6cecc2398ed0e975b04e207c529173dd7080162d4cafe1e054651390812
186 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 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=brandenburg+v+ohio+verdict PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fd05536114c3.pdfIn PDF document text
    • https://xesejiru.weebly.com/uploads/1/3/4/7/134716288/jifafunazivid.pdfIn PDF document text
    • https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/livotefezutexeveloku.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/giM5guR/81155989211.pdfIn PDF document text
    • http://fuburuxirafag.iblogger.org/55210082307.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/xghIhhf/96953482537.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/2221581.pdfIn PDF document text
    • https://cdn.sqhk.co/wamefuvew/ihrhchf/disney_cruise_line_reopening_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fe5d5ceae530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fd9383058240.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_6045e30301f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498348/normal_6003d3947f229.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/TieKbcg/37074560778.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/vavale/56745043171.pdfIn PDF document text
    • http://dijuforuzukogem.rf.gd/bawimuguvegusedi.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_49651d8d3ff04489a33ffe09ceb6ebf0.pdf?index=trueIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_2366a031b7e9440c822ab642e0b8e64e.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_aec7ea28d30a4c04ba847de3888e1e4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/ds_emulator_android_pokemon_diamond.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5240 bytes
SHA-256: 463995efba22e03a89e09099beac7bbd455012fa5387f29224c2da1beaa9933b
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10812 bytes
SHA-256: 5a1cbe803bcfe2511a7fc5b10c76096dc51c4bd61175d9c505b922be4149e947
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449