Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56772cce4d32a38…

MALICIOUS

PDF

70.6 KB Created: 2021-09-11 08:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 722271a5a36a7c7ab074680999f73156 SHA-1: 569604c9b23971954f51659e124cefb2c9c55205 SHA-256: a56772cce4d32a3843155d51e40fb5efdcf4ac74f02c3c11fe32011a4dabc7c1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link to 'http://lucidareemantenerepavimentifaidate.it/userfiles/files/zufisel.pdf' as a random URL likely serving a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=ppsspp+games+for+android+gta+5
    • http://cnhhgj.com/upfiles/userfiles/file/kapokexaxo.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/87164583253.pdf
    • http://alemotta.com/resources/original/file/73542889512.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/tosunavukegupevanatodoga.pdf
    • http://amindoost.ir/images/upload/files/molagivep.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufikezejivarogepod.pdf
    • http://geraldinekilkelly.ie/54759947335.pdf
    • http://laxycoffee.com/upload/files/jekujozomaliwiva.pdf
    • http://mintaialuminum.com/d/files/68832228696.pdf
    • https://strings97.hu/userfiles/file/pilunafewavizab.pdf
    • https://tsegypt.com/file/10095962304.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7b88c0097e4e8b1889be45346cbd3262/49226403430.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/jemab.pdf
    • http://xedaphcm.com/luutru/files/48640170645.pdf
    • https://binhvi.com/upload/files/ziwitivatepi.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/2733042006.pdf
    • https://ijfbacknumber.com/editor_up/bekilabumavod.pdf
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vigagobofuliv.pdf
    • http://aapltd.net/userfiles/file/22771776471.pdf
    • https://cobrawire.com/userfiles/files/watexixev.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/zufisel.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/lanijofowibofolalesazo.pdf
    • https://podgoricki-klub.me/userfiles/file/nuxapivamivewez.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c6782411ea62d33f65b347038ffae6d/wuwufuxagekadawunaro.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/xaxugesofel.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31e.bin
9651f763333d1507f11c2095856ab8616ae231eb5d96d496b1f32c692ae3c2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 15528 bytes
font_01_sfnt_off0000dae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16792 bytes
font_02_sfnt_off0000f300.bin
f40245f5537e1b5d722e8d29bed1af956273daebdb452a2ecbd6d02721a69f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10928 bytes

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