Malicious PDF — malware analysis report

Static analysis result for SHA-256 444f6bad70b5682d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-09 05:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 54094d5c3e74294b684970bc104e7b33 SHA-1: 3f155687af2008c90055c69ef0743542e860c7b3 SHA-256: 444f6bad70b5682d30de982ba3b8fec83bb46cf9ea106c879666338752a72e87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The primary malicious URL identified is maypoin.ru, which is used in conjunction with search terms like 'arena of valor apkpure'. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload delivery attempt.

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://maypoin.ru/wb?keyword=arena%20of%20valor%20apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fd76b5727deb.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/f6e1020.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/vasepidisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff8aab31293d.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/08c4416dabbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5fe7bbd350a01.pdfIn PDF document text
    • http://nidomamedop.22web.org/informal_letter_spm_interview.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/ddb1d3e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_601d507fdcea0.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/bupijila/america_s_army_3_game_free_pc.pdfIn PDF document text
    • http://tugujaxozulir.rf.gd/97276840773.pdfIn PDF document text
    • http://kunivoji.epizy.com/cholinergic_agonist.pdfIn PDF document text
    • http://zumoriko.epizy.com/akira_full_hd_movie_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/33825367654.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/spatial_reasoning_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/63658977106.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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 4828 bytes
SHA-256: ff7e3cd03d051312a7ae4c82d1bfebc62e9087ba97f40b7b66286ec1cda1b5aa
font_01_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 11432 bytes
SHA-256: 09a5755227a685bae149224e06a0088ca6ad40e1ec2e1829224d516b24d68c63

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