Malicious PDF — malware analysis report

Static analysis result for SHA-256 6153702bd89faffb…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 04:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 41385444d9d04c151d9199d041d6f4b1 SHA-1: da96d8ce90d302db25040ea1454eebbe14730770 SHA-256: 6153702bd89faffbd8570984fd1c4d112f3307b907ddbd7afda0dc8b26cac757
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 embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, likely for phishing or malware distribution. The primary malicious URL identified is baarspo.ru, which is presented as a search result for a topical query to entice clicks.

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://baarspo.ru/strik?utm_term=cuando+empieza+el+oto%25C3%25B1o+en+mexico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406775/normal_601457ee14153.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/dhcx4pk/69352666873.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/Phcjfja/18888926006.pdfIn PDF document text
    • http://fotuxeji.iblogger.org/42420814329.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/mini_lathe_duplicator_templates.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/zilura.pdfIn PDF document text
    • http://nexekeb.iblogger.org/ralupewikiwuxofajejutiweb.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/gevetivofafenikevajuvux.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/pesetufavo/68778933796.pdfIn PDF document text
    • http://tixinova.rf.gd/hodder_education_checkpoint_maths_2_answers.pdfIn PDF document text
    • http://gadudadu.rf.gd/collateral_beauty_full_movie_tamil_dubbed.pdfIn PDF document text
    • http://sojugixu.epizy.com/cg_bsc_nursing_2019_application_form_date.pdfIn PDF document text
    • http://wegewid.epizy.com/havana_backing_track.pdfIn PDF document text
    • http://matezule.rf.gd/sepsis_coding_guidelines_2018.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 5180 bytes
SHA-256: f0b39d4c7139a17809855a05e567b6c2edd108a192d66afd6c50803e1a346ead
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 11772 bytes
SHA-256: 76a77b17e754dc5941635dd35cecca85d665bf64c61bf14511c33cbea016f4ff

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