Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a2808196aedc20…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 16:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: eff1b978565c7af15470649661b6b435 SHA-1: 80633fd5f65fbaecafb8f9dfd2c332f0349a063b SHA-256: 01a2808196aedc201e6291e02993c31c2730efee535f8c5dd3305935e96c518b
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable domains. The primary URL, 'https://bologen.ru/strik?utm_term=how+to+bypass+thermostat+on+pool+heater', suggests a lure related to pool heater maintenance, likely a pretext for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+to+bypass+thermostat+on+pool+heater PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5ff23a7dd77c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd3bd90a3447.pdfIn PDF document text
    • https://xadixolikiz.weebly.com/uploads/1/3/1/3/131380305/kovogokuvupebomem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2dedc510f1.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/302023.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/86420dc9aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fd6651d4c952.pdfIn PDF document text
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/4131417.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/fukegekilovawi.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/5150438.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/gebesezikolururizum.pdfIn PDF document text
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/3811759.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/daxogofar-kajejatexopi-tizufuxa-ludekifitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6014c2d9450f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457620/normal_5ff23bddb025d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff28034956f5.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/jovekus/roommate_agreement_template_college.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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5356 bytes
SHA-256: e48c4c0e19b5802b05be54c45a8465a1de78d3f12745ded97907943a58182d1d
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 10896 bytes
SHA-256: 0d034af6bc9025288d163da9b18e07c3ee46ba993a7382646c0e9d77042e4d41

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