Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe703cf6bb0dcd7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 09:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 026cbad9770ef3622aac4c6546302b25 SHA-1: e04a14e7da418d83ee381a26da9554aabf1369d1 SHA-256: cfe703cf6bb0dcd7f5ed889ba33f070da127217ca8ec4a159a345b8afa35d94f
126 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=only+way+to+stop+smoking+permanently+pdf', are likely intended to direct users to phishing or malware distribution sites. The PDF structure and numerous external links strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=only+way+to+stop+smoking+permanently+pdf PDF link annotation
    • http://kxqcgs.net/filespath/files/20210904023734.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/kevifa.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mobemapusoxekefogo.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/28953490744.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/35112913423.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/kiguzidalefizuk.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/86673176993.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/13879646711.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/ragexi.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87206854618.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/zuzerifemovovakari.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/gajiwetet.pdfIn PDF document text
    • https://harom.ro/files/file/supizadimimovifuleka.pdfIn PDF document text
    • https://masihpt1.com/contents/files/metoresupotopom.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/12208930643.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/98118424762.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/zenedagi.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/rarelujije.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/romezirilemu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/waxug.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c9b1ba7---bojafupogifol.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xazamizemevokojuvizozi.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55656399065.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/tixajan.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16276 bytes
SHA-256: 946bb037ea311ef0c0ad8ff69316efa64ebb6f4c795785973ce277aad10e5596
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 11160 bytes
SHA-256: db953616a770f6aa4008a9a5a21bc8b75705064cb31087b309b5fab16b18caa0
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1