Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1b25e7c42fb982…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 14:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9e48a61ba186d2213eb7fbbb8e205f4 SHA-1: cd295bba28b7113175595e880c388aa0cf5cbc67 SHA-256: cb1b25e7c42fb98285d6f2211e953af7fd0639f306f1aae65de82079e8053887
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is weaponized to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=ocado+app+android PDF link annotation
    • http://studiorestagno.eu/userfiles/files/bevafaro.pdfIn PDF document text
    • https://togeltop.net/contents/files/91113452434.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec9ff3442c---mivelosumefimerolan.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/luxoriri.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/23862396174.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/48230768555.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/84276643833.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/gikudus.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/bugijegadojopobogez.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/76012484213.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/vupopa.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jusugekodoze.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/75495964218.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rozokurufofuledixen.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/8228210094.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/94396870458.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/51382800443.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/dabulavekevukewuxuxuvebe.pdfIn PDF document text
    • http://imbirimbir.ru/files/zomulop.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/44243255063.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/timusurirebod.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161446aba76521---xivagabazafabusinafu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/femowuzobinaxan.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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 15012 bytes
SHA-256: 4bab337d52b7f72f326d7506b7fbcd854f70eaa34ba351947f617cc34f76aaf6
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10088 bytes
SHA-256: 34fff8dd9edcda40bd27705781339847016445806ee86fefc7dd140c6dada0e6

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