Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e2cd8c2371ac2…

MALICIOUS

PDF

77.7 KB Created: 2021-04-05 20:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 267af162342e3e63260787f996a7bf33 SHA-1: 74e3e4f937e80a4494dc904de4757afb8a4aef59 SHA-256: ac0e2cd8c2371ac2820c406732d880e3428e0e6172d59fef26442c4302cc6de7
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 0.9998

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://zajinet.ru/strik?utm_term=supply+chain+management+jobs+salary+in+us PDF link annotation
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/7482033.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/fiseza_vedavo_xaxizipegate.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/1605157297.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/how_do_i_use_my_nesco_pressure_cooker.pdfIn PDF document text
    • http://mesretly.xyz/casio_5081_replacement_bandqsu52.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/86766437044.pdfIn PDF document text
    • https://lixevipilevorox.weebly.com/uploads/1/3/4/6/134634278/bijarumekojub-gupife-selagosaso.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/cbt_worksheets_free.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/7219995.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/personalidad_anancstica.pdfIn PDF document text
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/cf4a60.pdfIn PDF document text
    • http://topsalon.xyz/how_to_use_an_apple_computer_for_dummiesg4vnn.pdfIn PDF document text
    • http://miiliioner.xyz/roblox_aimbot_2018_phantom_forcesoh9oq.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/topipovikapari/samsung_note_10_wallpaper_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/60527870873.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_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 5768 bytes
SHA-256: 2dd416ba064e67a470c8b942c1d8ce5530218d3f787ef0eb35ca83cde928cb0c
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10848 bytes
SHA-256: b3151f9ce0ec711cec0ce582cd19aae941016c406c2cd036a531a685cb4121fa