Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed422116288af50…

MALICIOUS

PDF

74.4 KB Created: 2021-03-20 04:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b84e8c6e70fd7d0f61632583a7eddc SHA-1: 9abad5f196d5b64961a68196a4b08bf2f33048f1 SHA-256: 9ed422116288af50fed8ed11e88bd025e11ba9165fc676a18faa171ebf6c5630
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files with generated-looking titles, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/wix?keyword=personal+financial+statement+worksheet+pdf
    • https://cdn.sqhk.co/pabefidinaz/sgiKDlk/59244149499.pdf
    • http://islemleriniz.org/momentum_and_impulse_worksheet_answer_keyye773.pdf
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/7303624.pdf
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/3442039.pdf
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/750110.pdf
    • https://cdn.sqhk.co/zavilisuga/bfCCrU5/stickman_flatout_mod_apk.pdf
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/nufugal.pdf
    • http://prizinsta.site/77530704761cgb32.pdf
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/wulomivabamo-funipepexade-boxuf-tetizep.pdf
    • http://piredvizhnik.com/mobuworitufatatagj4i0.pdf
    • http://trokot-online.xyz/vikings_season_20q7tn.pdf
    • http://amorexpo.com/717105581488ur7e.pdf
    • https://cdn.sqhk.co/tezasevimab/BjgPijs/16726856726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_d70e3284e93c45d28860545d5490cc49.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_8e98008743e6492d85070ca979e9a4c8.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_0e501707435a40ffa3f14b2e4efbd45f.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_a81ea903a4d242eabce0377d7dae0532.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_8489c3a968d44e31b9ab8346187ab291.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_off0000e6b5.bin
71db4b5a1de204327da54c6c6dd27a58474ef7c64dd7580ac69b624abb628980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5552 bytes
font_01_sfnt_off0000f97b.bin
49328443c3ff2fc45db224791e14c68d6fde2473e1fcb466b29fc485ac174781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10284 bytes

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