Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9549d6caa93a12…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 11:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffcc1921c19caaa96673dbea78f020c8 SHA-1: 5f5b4e0c287631b80e4bda54bd06514355526940 SHA-256: 1a9549d6caa93a128eaa1c9fa5ab9bec2e52d6a885a86d1ba77a6974c25b7412
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=twin+dragons+nes PDF link annotation
    • https://malabarmail.com/ckfinder/userfiles/files/vonev.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/14872965633.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906032002.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/venukexopikebegaje.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb6d5ebf9f9d31d459aad8025f576829/gawimubarewotavufo.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tujikeduzojefajudan.pdfIn PDF document text
    • https://finliz.lt/i/File/luwalesazuzokukefo.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zigesojexolu.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/91746914820.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/topewapizawinime.pdfIn PDF document text
    • http://poorclarescork.ie/images/rebazebadajuxejevoxabibu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tobuwavokofetabirula.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/87409234871.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/debd1bd7ee0e220593f600485100df04/44161855137.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/fegibudisixijoxeg.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/38449327339.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/13721096929.pdfIn PDF document text
    • https://12waktu.com/contents/files/94677957778.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/dazexatolizetubadaxew.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zadejapefoduburotilosu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kuvubaxefutilebuwizemol.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wawes.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/52609959373.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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 20828 bytes
SHA-256: 56ae4a246b91548880b11a28d7f1b685b5e19168a4521e014ce32fb56dc5abcf
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10328 bytes
SHA-256: ac62d398452075003dc35c054401668aa2f6b28ee1906a58dc66582dd1ebd5e1

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