Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d89f55eb99b49ce…

MALICIOUS

PDF

77.4 KB Created: 2021-05-26 04:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 858ca2355dc9a6a3acdb0590ac917319 SHA-1: cede2fd041100b4c5b6f2d4b566e070dd1550374 SHA-256: 2d89f55eb99b49ce2b0c1bda4be57b9f9a0213dc4f459be36e5cc96262218e5d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL (`https://jacksth.ru/strik?utm_term=gilbarco+advantage+error+code+4353`) which is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it might be a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=gilbarco+advantage+error+code+4353 PDF link annotation
    • https://damafurota.weebly.com/uploads/1/3/5/3/135337485/bodemuvijusif.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/3505353.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/kirovidila.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/vusumajolesepej_sebeliv.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/xisiwaru.pdfIn PDF document text
    • https://faneputivodi.weebly.com/uploads/1/3/0/8/130874667/kepefexiv_janepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/532d1d72-7418-420d-9b06-fc122dbbc31d/72264607063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28106c95-5a0b-48ce-94e0-0b5622c06774/demigods_and_magicians_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb58c71b-b398-4af2-973f-464ffe61eea4/heat_n_glo_remote_wont_turn_off_fireplace.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/mp4_hd_movies_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/33845480547.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/facebook_videos_online_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6937835b-9263-4b8d-b846-c2d6f9849c74/the_mill_on_the_floss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22beb45d-48a2-4a7c-976c-96245be7aa3e/moxijiwewadi.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/dukomununawadileworegukuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8acd86-fc7a-4178-a009-854ca502b356/what_does_don_mean_in_english_slang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e626185c-50fd-4cd8-84f8-af7ab2919306/chamberlain_41ac075-2s_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/giwowafevugefapewe.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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 5536 bytes
SHA-256: 9b85a0d7aff664eded6ffaff4f7f035247ae59246a805fd2cdc7f51a0f44ee2c
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 12016 bytes
SHA-256: 17f9e4c382bf4aed193294aea76425069b319a9c8f5ed48146cce01507f77988