Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bea77a3fea46e7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 10:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b44f1131f6db0908ebb65ad8ce2e6833 SHA-1: eea0a28010f4a42502eaf3ac937b68b5c53794bb SHA-256: b8bea77a3fea46e74394b881cea9fe9f4ed1b974fa720f1fd4b560a79351c8a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the file's nature as a collection of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f148d0ba8---zudukovubelimowubu.pdf In PDF document text
    • http://sxhk365.com/uploads/file///demudug.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/movojakinotukimibalap.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/resoborudoda.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/27130785298.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/75ef0a650b6acc34c14f0060c787fc32/bajegudusokofemomux.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/42555961318.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/6703347894.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fitamatunosajatol.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/meseximete.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/kiwerebuzigonupunad.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/90599576000.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/83324371637.pdfIn PDF document text
    • http://osayit.com/images/file/65902935082.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujapijisulajenaxa.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090712504021.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/niwibifolewej.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/xuwidozepukibugosa.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/xezazutipixubimesad.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/3098847209.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/30188977835.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/34715996426.pdfIn PDF document text
    • http://maidichike.com/upload/files/gixepi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wedaluvebetozekusipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+gta+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 17724 bytes
SHA-256: fa33a994a43344de2c137f4e4fd8b4ecfd6f1fc78d58a40e77e8679c70ec5e7d
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10096 bytes
SHA-256: ee8bfc818b82e3afd61344a5e1b4db7d45602475f99783fbc7bcb2e8071b6254

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