Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ff57fb71f3f537…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 13:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57b610c49b0138cb107f62dbb69c5a0 SHA-1: a944afa756b271e6428135950d636df66dd47650 SHA-256: d8ff57fb71f3f5374f26ede8c900d8fef59d42b3907708f47a4708b4fda44834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=stick+nodes+pro+apk+free PDF link annotation
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11395892885.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/dekapezeveja.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xugomusabora.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/30266557175.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/legokodorovodaxusewexeg.pdfIn PDF document text
    • https://synersys.fr/contenu/file/givaz.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/gogopupijav.pdfIn PDF document text
    • https://petribax.com/userfiles/file/wipopalimabodovepotoka.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/39899443476.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/6500481597.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zatinijobizo.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wobipo.pdfIn PDF document text
    • https://sanidom.pl/img/file/54799398219.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/sivomuzasuvaseberug.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/xomutonegegipiguwir.pdfIn PDF document text
    • http://jawarakreasi.com/file/jixubukelakizuvod.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1ut53qm37r9l3t2a3s63mr7og5/xekexemusebelidij.pdfIn PDF document text
    • https://majubesar.com/contents/files/30153620670.pdfIn PDF document text
    • http://jawarakreasi.com/file/wapiwasan.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/lobaganavebamubutojelu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/jopitizajabanowarepena.pdfIn PDF document text
    • https://nada70.org/userfiles/file/49797566287.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/dexakiworagesizoje.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tapufegivatikovex.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613012b25c04b---2454069420.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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10736 bytes
SHA-256: 52b73af451a5463b5b04a4e69a91ad4787e31fa0110dcb48cde60649a4a782ea
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 20316 bytes
SHA-256: 3ae133d21179c96e2f03e359cf56772b2c456cc7872cee00774ff3c57796e42c