Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83980c1822871ac…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 07:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33b83a310153f39f50875f52f7b61138 SHA-1: 1d821fe9e0ee08beb6883b7c59bd8fb50fb3ae69 SHA-256: a83980c1822871ac0471c8ec31caf570a25efdf69f401cc1d018bf28ee4fa640
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=boku+no+hero+academia+watch+free PDF link annotation
    • http://metisentry.net/ckfinder/userfiles/files/waselowejekonumujig.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/nozixawobetabalepexaz.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/vegilibewelebajefinazim.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210916111219.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/gegewi.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/16137166505.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dalesimafirikelix.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45970286634.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86400528369.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/ximodurifekurusewijutagu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/fopav.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/47204987108.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67416632567.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d6bc46b8---96412835932.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vaked.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/voxajixozujudi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/pajemol.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fajuzedexadukujakederex.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98e295cb6---rutanapakobevapowu.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/44018613684.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lixixotowudutivam.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/67426472443.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jujafodes.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.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://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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 18296 bytes
SHA-256: 04d150238cc531569fe620967acdf8aa1f27bac5c4c9c8fb36cbd2035ba08ad0
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10860 bytes
SHA-256: ffb12af662588aa63419cfdbada8bb347be26a5179a5095b5027d7785c006735
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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