Malicious PDF — malware analysis report

Static analysis result for SHA-256 c612235044204f2d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 212cfbc8f3eb6fa0220ecaebd6aa6192 SHA-1: 16620bff66a758af1d4551d277c3c006a650044c SHA-256: c612235044204f2d352344dfe5fc73f02896f2414c699fd5a9ef65bb34860e71
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the ultimate destination. Heuristics confirm this behavior, flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=iso+20000+version+2018+pdf+free+download PDF link annotation
    • http://e-restauracion.com/app/webroot/files/uploads/files/99609100071.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/19726231744.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/46412154562.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/notejebadetawujodidage.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/pupisevijefexujogelex.pdfIn PDF document text
    • http://rc-modeller.se/images/file///goxirisesixepuweravu.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/49352512005.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/96954539870.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/nalof.pdfIn PDF document text
    • https://comfort8889.com/upload/files/60273076149.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/52419620081.pdfIn PDF document text
    • http://unseretochter.ch/images/file/17941706900.pdfIn PDF document text
    • http://vina2002.com/uploads/files/26568556272.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/15810994941.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/28207839976.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/xunanorigavonitawosomadu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a8866a0285bacf772b50e5edc890e304/nodexiwa.pdfIn PDF document text
    • https://path.mn/userfiles/files/logoveteridunoropujafer.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/kaxixeneriv.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/27485841586.pdfIn PDF document text
    • http://bdsductri.com/upload/files/19011871085.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fknh4raejqgrvmg5jpuo2n18tu/91409227071.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/60212204529.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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 17100 bytes
SHA-256: 4f51f278b0ff4ab5bd868511cd5534df4f581237a6f9d32526d257f9ae909c8c
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 11000 bytes
SHA-256: b82236098658217a3c5f78a6e2881b0bbfccb34ca2aaf093103755f8230993ff