Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8febc391f7f9c…

MALICIOUS

PDF

73.3 KB Created: 2021-02-10 02:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25a20b62730ae0aa55b9c81d7d335df4 SHA-1: b71c775439dcf2520a4a6b7a67f29b28a1f03955 SHA-256: a1c8febc391f7f9c621dc6fb04d6eaf0b907f6ea945a8d32c1b2cb3f4df83d2c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=online+mandatory+reporting+tree PDF link annotation
    • http://copyrightsupporteds.com/13623068462xg6y0.pdfIn PDF document text
    • http://kernig.online/psoriasis_causes_scalpcl487.pdfIn PDF document text
    • http://mini-cam-v2.club/charles_law_problems_with_answerszxi9h.pdfIn PDF document text
    • http://jitutirujemi.22web.org/tommee_tippee_perfect_prep_machine_user_manual.pdfIn PDF document text
    • http://sacredname.ru/bengali_movie_hd_qualitygm1ms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_6012333c7a7cc.pdfIn PDF document text
    • http://menbp.online/tebibirufug89zvv.pdfIn PDF document text
    • http://idealicacolumbia.site/are_green_sweet_potatoes_safe_to_eatze0ga.pdfIn PDF document text
    • http://vir-tus.com/smartwatch_pokemon_go_plussybbf.pdfIn PDF document text
    • http://kubifadim.iblogger.org/algo_8180_user_manual.pdfIn PDF document text
    • http://coloradocustomelectric.com/banalites_poulenc569qn.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/499642947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6010ef9416ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagisejokunego.rf.gd/61515902448.pdfIn PDF document text
    • http://kitasiru.epizy.com/55193222471.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/zasoxane.pdfIn PDF document text
    • http://rabibunipidozok.epizy.com/18662489141.pdfIn PDF document text
    • http://renunuxuxalebav.epizy.com/sonovixubaxosene.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5232 bytes
SHA-256: 727e5606a4a2b43c01fe57568d5d58c498c6e51f556c9e726e6b48949b3c48fe
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 10360 bytes
SHA-256: 468ecc7164e879538dc7cf634ceb59615662b4025d74dcb07d832f5ffc5c20fa

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