Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8439489d1c78a38…

MALICIOUS

PDF

124.3 KB Created: 2021-05-08 06:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aaca12513784a3792c9ce92f451371d8 SHA-1: 16adbfb0e7244a343e9154d9e453b262426632cf SHA-256: a8439489d1c78a380a045f45e26297dc49ebf9cdca1953e99200ac7eb1caea02
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a "Toyota hiace radio wiring diagram" to entice users to click on the malicious links. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=toyota+hiace+radio+wiring+diagram PDF link annotation
    • http://lovewaits.ru/sozametefavabjlu63.pdfIn PDF document text
    • http://tertov.xyz/juzijima7r9ix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_60625ab6e2f71.pdfIn PDF document text
    • https://ralarikekesaj.weebly.com/uploads/1/3/4/2/134265376/018634e21de75b.pdfIn PDF document text
    • http://knitfqph.site/usmle_medical_ethicsgelht.pdfIn PDF document text
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/zezukixunax.pdfIn PDF document text
    • http://gowisogodedugu.22web.org/63419170147.pdfIn PDF document text
    • http://dmgameplan.com/dnd_3._5_bookspgvbm.pdfIn PDF document text
    • http://vodoroding.info/12404385387472zv.pdfIn PDF document text
    • http://kufadudaz.iblogger.org/xajurivimotafulitafufagup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_5fd3495d8c995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_602f24deec0b2.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/dalava/53634242783.pdfIn PDF document text
    • http://dafadewu.epizy.com/sawirabuligesi.pdfIn PDF document text
    • http://pimibini.epizy.com/30201793440.pdfIn PDF document text
    • http://gaxusalimub.epizy.com/developing_skills_for_the_toefl_ibt_listening.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/16692272395.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/zubevavoreluzabifuvigu.pdfIn PDF document text
    • http://nitaxukim.epizy.com/widoxigobavixogobovow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D9 5284 bytes
SHA-256: 17c93358898049659b4d94efe18f695cae121ba6608793ec896e329cd928f6ed
font_01_sfnt_off0001bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC6 11660 bytes
SHA-256: 4d5b047163de6677da3b21332fc464ea62a6ef5d53812de56d1f25d448f0dfc4

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