Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d955d9d18d10d…

MALICIOUS

PDF

88.4 KB Created: 2021-03-03 22:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ebcf47c7cbd810332c44b62b5bede5b6 SHA-1: a21ee1b1474e545ea72b627c35e878f1cef1f9f0 SHA-256: fc8d955d9d18d10d45903345aa62512c9041fa6e4b503e4cdcc0c61cdad74bfa
166 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is a link farm and uses suspicious links to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous suspicious URLs points to an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/123?utm_term=simpson+3000+psi+pressure+washer+engine+manual PDF link annotation
    • http://wrinklestiltskin.com/saxukilurolopokob5gkt.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/iaEieBt/pinball_wizard_lyrics_song_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/jiVhjif/phoenix_wright_ace_attorney_trilogy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_602b06a051b6f.pdfIn PDF document text
    • http://ig-supportcenter.xyz/53665052267wjirj.pdfIn PDF document text
    • http://world-wild-shop.com/pajomupajuzotexk4d2.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/b9718d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_600a0a7200135.pdfIn PDF document text
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/9388876.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/djejdij/minecraft_diamond_portal_no_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/6BQiggc/santa_run_game_online.pdfIn PDF document text
    • http://realwockyc.info/todoxam4uut.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/nukojoxixoke_jugaxu_lugagubesefiz.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/b372ef.pdfIn PDF document text
    • http://usmileofficial.site/capital_asset_pricing_model_questionplpfo.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/seriposuj/mcgraw_hill_connect_answers_macroeconomics.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/how_to_do_ratios_in_simplest_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/jojigemilizitopigul.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_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 5732 bytes
SHA-256: 68b6cba26e08740a0f0b960f390a5110f56c48ad29fb2e80758f65cde455a56c
font_01_sfnt_off00012f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F93 11024 bytes
SHA-256: 1ff171cd69b36320cb36ca037a2986cddde1d1103027cf4ed004018ba67f607e

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