Malicious PDF — malware analysis report

Static analysis result for SHA-256 9641bef939db90c4…

MALICIOUS

PDF

81.3 KB Created: 2021-02-22 11:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a2427379b750e10b71f1dbdc8ec3713 SHA-1: 34cd8842b7d7e47abfcd4cfe7a4bda84d9e49bab SHA-256: 9641bef939db90c451d7960b5461c0055b9476cd9494a8511788352263bd9154
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 URLs, with one prominent URL pointing to a site offering cheats for 'Crusader Kings 2'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to host links.

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://jottigo.ru/strik?utm_term=crusader+kings+2+cheats+show+character+id PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5fec76adf0599.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/iagjd9t/iphone_11_wallpaper_hd_4k_anime.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/mipafetadirafugubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601b3717308dd.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/3576507.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/rjdjeic/dreamers_vault_champlin.pdfIn PDF document text
    • https://cdn.sqhk.co/sewoliwadumi/ibicgew/happier_living_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/Vvhjigk/kritika_the_white_knights_mod_apk_2019.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/xabotusupewawi.pdfIn PDF document text
    • http://groshyk.site/63413923168rmgfs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5ff2059906d41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6015be5c0b8a6.pdfIn PDF document text
    • http://fastpeysistem.online/adidas_yeezy_slides_price_philippinestqssl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavolimuteso.epizy.com/2011_chevy_equinox_ltz_owners_manual.pdfIn PDF document text
    • http://fokogemuzaraw.epizy.com/13404281693.pdfIn PDF document text
    • http://lipubumili.epizy.com/the_cask_of_amontillado_short_story.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/97253516995.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5360 bytes
SHA-256: af728f985de401302f66ea5d663d02383edfb5db163672b725342474167dd35c
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 11492 bytes
SHA-256: d777f0b3786af785d636a57f337553a543ad60271f8dc83ee592357905117a2c
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16164 bytes
SHA-256: 2a8bc0c2a2fb9f3f0863b9bff3abb8acfeff83dc7fabe5a7618c83d4ed6a9dd8

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