Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f560b32dfea4f3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 22:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a656fcaeeb785243bbdd3a4fc6e2748 SHA-1: 538985a01e3e53591f52a4bb7b3a5640b8ab0a26 SHA-256: d1f560b32dfea4f3232366eb427d8b69c3d2020f471cb94be5c947f8b0fb43af
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_MFA_LURE' suggests the document is designed to harvest credentials or abuse multi-factor authentication. Numerous external URLs are present, with one specifically identified as a link farm on disposable hosting, likely leading to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://wastran.ru/uplcv?utm_term=how+to+delete+phone+numbers+from+my+phone PDF link annotation
    • https://amursvoidom.ru/media/files/karivapikosevekawekimef.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/83690992087.pdfIn PDF document text
    • http://belniig.by/public/file/43203806956.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090219111970554.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/31737454569.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/43344995782.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/40957764154.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fovulatal.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/sufodiminiwusobuvug.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/mijitomurutonuseb.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2b3863c4---dawatelapalugisuxi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/gubipomidesexasukepug.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/lukowaxogu.pdfIn PDF document text
    • http://charontrade.hu/data/file/kokutojaxiwarutapuwixalif.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/62693237630.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2199089887.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/bufelemovuxujepepamam.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/rorelafuzotoguze.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57618644785.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/52278958845.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/90936557187.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/faxafodulijebajababavodu.pdfIn PDF document text
    • http://talesma.com/E/file/67085903108.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/47000734962.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_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 16680 bytes
SHA-256: b39dfab310d60d1de5315420dbec5530430bee2a0df187036effd0c48d2225ce
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 10940 bytes
SHA-256: 5a6d0eb4db68b7a7530be1f9b6e9638ed4843ac33f3d7832d2e1513c5021cc42
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1