Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f22fbe07152b1…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 00:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83099f32c44864b83a69b8cf02e57a2c SHA-1: 4cf6514547ca16ceb3fd15ca7c913e8c34b2272a SHA-256: f20f22fbe07152b172542fb7bfe9c4a035629a4d4a9d9bdcb58c587caa53cdb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were extracted, the presence of external URIs and the link farm structure suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=mod+master+minecraft PDF link annotation
    • http://c2ctrading.org/cms_upload/files/27895056315.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/97496780103.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vabulewolijinoper.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/xazus.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jogujige.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/16798452465.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/sukulopifena.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6ce1ec65---wolod.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dd0abf7feb096130b38e41599d8e0c80/zifujakasuregaza.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/dezomado.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/fupozopunobelibikekax.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/56667949508.pdfIn PDF document text
    • http://pedraferro.com/files/files/80478415489.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913081103041698sla2w.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/16441121353.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/21202528615.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65731303146.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/linixateritenekunel.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/87216025604.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5167650559.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/firadawosalis.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/tikokibiwagodeso.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/zobudeje.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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 19208 bytes
SHA-256: b2d275089dab13dad1a4bd4212c75fd782dab882b3c1f908c38e3c5e8d8ad767
font_02_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10584 bytes
SHA-256: f0e3269f35b190f15c595b837d0d58bc4008677f8201880c67c6df9e0aef0095

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