Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cf9ea31ce591fc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 21:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f09a521a741c524a9c33c8478877af4e SHA-1: 06a432f3a22beaf3409042a5312607256c0b0f43 SHA-256: 80cf9ea31ce591fc8bd1dd0a2b18a0d8778e19b69bbff9dca3a95989c678c2df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links to other PDF files hosted on various domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://henzefashion.com/userfiles/file/wamimod.pdf In PDF document text
    • http://amindoost.ir/images/upload/files/ronavazikadusajosotete.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/buraxekipuxob.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/widubemunisisafeponik.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/44319355820.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/tapotawasi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/13669629008.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/57090241374.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/29048717482.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gufus.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/94563387125.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139512a120a8---12368413825.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/28848543541.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/75069256823.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/40964112672.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-19-18-14-54.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fiwomufajarudoza.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/zuzidabelukekiloj.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/luxifitolawo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jipebotavamez.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/74251072832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apk+change+package+namePDF 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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10272 bytes
SHA-256: fd53189462401611421bc80fbf67021a9ecbd34f591179982caee3ab533f7004
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 17096 bytes
SHA-256: 464e1fc90f025477cb07f1c43fdb7cdcb8d4914dc177a5bdd2dc0cdb3f9e3948

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