Malicious PDF — malware analysis report

Static analysis result for SHA-256 a034e30d779f176a…

MALICIOUS

PDF

74.4 KB Created: 2021-04-22 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 92a29e97a6ad808c2bab44c705c64e49 SHA-1: 04682e0bb93488841d9b57f2bc2a697326a516ca SHA-256: a034e30d779f176a86d44ee2ced16608956315221470b20326f9f477bc6ca94e
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'lazy boy sofa recliner parts diagram', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/strik?utm_term=lazy+boy+sofa+recliner+parts+diagram PDF link annotation
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/sitafit_zijukegeru_sasakowabir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_604b537149238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_604de0a7a8521.pdfIn PDF document text
    • http://natnat.fun/40111216728f70q1.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/de0fa9b6f5863.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/gijomim.pdfIn PDF document text
    • https://nifabixiguwo.weebly.com/uploads/1/3/5/2/135295020/3bbd920bc72594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_5fdba6cc9db0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_5fd31406b725a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_606491e96b59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_6052be7699408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fce74addef5d.pdfIn PDF document text
    • http://cryogen.me/tijevibisitidiwirepplsmi.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/8947710.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/fofeguj/nios_assignment_front_page_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/hollywood_movies_2019_in_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/aws_api_gateway_cloudformation_example_yaml.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/jetokafopo.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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 5708 bytes
SHA-256: d78eb23082ce105d758052c7d980a141086c73724adcb3ede4d10770a5444f45
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 10940 bytes
SHA-256: 07ca048be6442387b7b626dfea83e557c7bb8f90c877612c3149acb4ecf4d093

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