Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73a7a4f1aad66fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 14:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 378fa8ff013cd883b11f6f39983e5a8d SHA-1: 19f4555188098bdb4b76d2a830907dd7c1c97106 SHA-256: f73a7a4f1aad66fe13978422d64a20a28bffbba867e605fe9916636fa58df2ba
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to distribute malicious content or phish for credentials. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://qnzar.com/files/mizineselarugusel.pdf In PDF document text
    • http://fmi.lu/userfiles/files/sewetibudomawujalilagi.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/87026071718.pdfIn PDF document text
    • http://hevolta.com/upload/file/99405671280.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/78484768545.pdfIn PDF document text
    • http://chineseclothingonline.net/File/2386200509.pdfIn PDF document text
    • https://armenia4d.com/contents/files/vokamopeda.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wefikozafunajetam.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/93609207121.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/werajebabilunu.pdfIn PDF document text
    • http://cataga.de/beta/files/file/dilinajopasonuwekezipapod.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/61951080361.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/16089234489.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/22837143619.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/31144028377.pdfIn PDF document text
    • http://lovesenergy.nl/file/91591297905.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/81998774450.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe971ef90---mefulenubiludituruguzot.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/33264349633.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907113055.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/barujex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=find+vertex+form+from+graph+calculatorPDF link annotation
    • 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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 19188 bytes
SHA-256: 96d82d09b31970db8e99db31fdd6e3b3ce1da87a699371a875ab27c11d147938
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 11144 bytes
SHA-256: a1574e78a03104ad3085c708692117f4e97cd737d60612abf35e51d4f363ed9f

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