Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a68ed72de77e80b…

MALICIOUS

PDF

66.7 KB Created: 2021-01-30 08:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87c3de9adf039d9caa20593cdb149e4f SHA-1: 76287c90c533a9f0283f2551b8faa7c7d3c5661d SHA-256: 4a68ed72de77e80babb28775fab943015a30c07697520f6cc9e403f0e8035576
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://leonvi.ru/123?utm_term=ref+code+s0600+mean
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/9410586.pdf
    • http://sungo1.space/jukuvefokawewapixq1e7c.pdf
    • http://varietystore.website/off_road_racing_schedulewxvew.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/nifoni.pdf
    • http://maximizator.xyz/79643921268eslkz.pdf
    • http://bet-info.ru/bivimuregemepijimiiwyhk.pdf
    • http://nasty666.space/magic_piano_tiles_2018_narutou4460.pdf
    • https://cdn.sqhk.co/tazifawixax/Egh6HWx/riganomomexivubogukive.pdf
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fef8131a8fcb.pdf
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5ff33a3c0611d.pdf
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fd9608737341.pdf
    • https://cdn.sqhk.co/wibononuve/eVokibm/dual_sport_motorcycle_helmets_australia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/turip/89086201992.pdf
    • http://tinulelor.rf.gd/guided_tours_london_england.pdf
    • http://jawevobafepen.epizy.com/zoxefumerak.pdf
    • http://popeganezawojeg.rf.gd/tuzagomuxizafuma.pdf
    • https://s3.amazonaws.com/xeroguru/41629243450.pdf
    • https://s3.amazonaws.com/runuzitexokol/job_application_writing_format_in_english.pdf
    • https://s3.amazonaws.com/jigezilor/mr_loverman_bernardine_evaristo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ad.bin
838b18792df36e6eacd0293e3d4eaa5f7cf0783fbaaa8fdfdcc34224c1e0f321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 5344 bytes
font_01_sfnt_off0000dad1.bin
8a23c4d9710ba6cff317db66ce1adfc9749e4e72fb6a3459de380517b14365a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10392 bytes

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