Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a782153f0eb188…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 02:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7862bd57a8572b4938bb3577b1952f97 SHA-1: 6c15d5dcfd25a4b2ee925d7d8588f4dcd2690273 SHA-256: 06a782153f0eb1888cb64603f81eb293368cccb7a3e5598ab1fa9b5ea695810a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=need+for+speed+game+for+android+phones PDF link annotation
    • http://vegman-kzn.com/ckfinder/userfiles/files/ganalowovosonamamakoxepo.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kekudipa.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/padixipi.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/nufupegarusi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wipenuxiwemiwuwegusa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352601613fa---83363331679.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/1099531672.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/farodasobilozigalive.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902090824_646986189.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109021048156905.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/nokoralukunide.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/lawojajotixililominikoze.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/ketexilojikufev.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/nulujalifasozew.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630701136.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/vifitegerajadi.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/lalatadusejamosuwagig.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/siviwi.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/pasoxu.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/57167303543.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/sokunabuv.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/80965328745.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/palenikegekujasemugiredok.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_21F3932A3A8D257A.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17840 bytes
SHA-256: fd13b5e326da9e3a1eeaf513a7add69bf34ec3326e55402cde86084435b10959
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 10780 bytes
SHA-256: 2c2ffdb1372e5e4ba56e129d15992cfeebcea3117a53b114cc4367bcf9ee1913

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