Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a5c638dc4079bf…

MALICIOUS

PDF

75.7 KB Created: 2021-05-22 10:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3c24c42d39e275f765daf7aa53a5099 SHA-1: 541862f0b44167ef758696092a7073e9218d66d4 SHA-256: 33a5c638dc4079bfda7b226cf5ec435bff1033bef1c4c2b66b72ac482057c931
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous external links, including one to 'https://bologen.ru/strik?utm_term=free+access+database+templates+for+small+business', suggesting a phishing or SEO spam campaign. The presence of many external links, some hosted on disposable domains, indicates an attempt to redirect users to potentially harmful content.

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://bologen.ru/strik?utm_term=free+access+database+templates+for+small+business PDF link annotation
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/mijipesoxuxef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5fe02033752ef.pdfIn PDF document text
    • https://mojibivod.weebly.com/uploads/1/3/4/4/134490358/355334e54.pdfIn PDF document text
    • https://disuterobusubu.weebly.com/uploads/1/3/5/3/135305861/bevozu-dafazo.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/9095225.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/vewegufebi-lukopubowexe-zazifilul.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/69e70622b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6044caafb754f.pdfIn PDF document text
    • https://mapazudisobamun.weebly.com/uploads/1/3/4/6/134604154/9635fca8.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/xejubivajukasi.pdfIn PDF document text
    • https://lufavipipoj.weebly.com/uploads/1/3/4/5/134580953/9177eeb7d08bc8.pdfIn PDF document text
    • https://jevetokisavov.weebly.com/uploads/1/3/3/9/133997370/jemoki_kifugipewoduke_pasifame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fdb76d6ec60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_604f43a4cc691.pdfIn PDF document text
    • https://zenijubam.weebly.com/uploads/1/3/4/8/134884092/ninomapizosipob-jibagamememav-beditax.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/jumedemimo/50557660720.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/ihss_electronic_timesheet_mistake.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/realtek_audio_driver_software_free_download_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/bizaxavimubosoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/vejobovobimaxuwonezogo.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/how_to_sew_a_simple_dress_for_beginners.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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 5396 bytes
SHA-256: bba063beaca1a4e82e5ba526c3f6abe9a1361c0f96e77bb58a10f9c7a7a6e521
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10976 bytes
SHA-256: ecf38d16c273fc321b81522bcceaa9c521a9a92ddf67ffea630b49ffca245c55