Malicious PDF — malware analysis report

Static analysis result for SHA-256 071c995410a4eab3…

MALICIOUS

PDF

95.5 KB Created: 2021-03-11 20:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020be8ff81337448ccd55b400cde29c2 SHA-1: 7dcc1a829bd798ff62635a6b6ee0c36fb41df736 SHA-256: 071c995410a4eab3d3af9bb1cbc64a87775ab9895e205a5e187c565f74e465fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URI points to a URL that includes 'award' and 'final test pdf', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to a network of other PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=new+headway+beginner+final+test+pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6049f05d6f420.pdf
    • http://gravkamen.ru/power_pro_spectra_braid_reviewofnr5.pdf
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5fcb10e6ee1b1.pdf
    • http://copyrightsupportforlnstagram.com/livery_template_bus_simulator_indonesia8qm9e.pdf
    • http://haifaiv.ru/mogumoniradixono7bo12.pdf
    • https://cdn-cms.f-static.net/uploads/4422909/normal_603a4dde057a8.pdf
    • http://indir-kazan.com/desejerumewevuar3vs.pdf
    • http://magazinrf.xyz/song_hits_2020_tagaloggy3fb.pdf
    • http://uspehdnyaaxyz.xyz/broadsheet_melbourne_best_coffee_houseswdwwx.pdf
    • http://konsalting.info/41178565442e7am.pdf
    • http://zelopaqq.xyz/league_of_lords_show_castvnlg3.pdf
    • http://smartcoin.design/12562415640x8q3z.pdf
    • https://cdn-cms.f-static.net/uploads/4382952/normal_6048e229b7844.pdf
    • https://cdn-cms.f-static.net/uploads/4501045/normal_60260569ae880.pdf
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fffead8789a5.pdf
    • http://agent-spv.space/biblia_pierwszego_kocioa_chomiku4zx.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_603b355fe53fb.pdf
    • http://spindlndou.space/rogue_buddies_3_hacked_arcadeprehacksph47z.pdf
    • http://kukushpa.fun/faxunipiwoe46.pdf
    • http://igme.site/rovomatafanuxisibaro2ewkr.pdf
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5fda57b88e8e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_5908f1c43b7844de927d09c878450018.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_7795319f72514f358b65264e5313c83e.pdf?index=true
    • 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_off000135fb.bin
d982df0bad028a4beed155eb03184a138b0d027f34ea0cc5d27ec2582107d61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135FB 5608 bytes
font_01_sfnt_off0001491f.bin
86608819e8d5d89ef48b9a25f8062fba7134eced73bcb12bb7bc9a105b9cf75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1491F 12416 bytes

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