Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd336cef8326fc70…

MALICIOUS

PDF

71.3 KB Created: 2021-09-22 11:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4fb21450472ca134ab99d8ec3869ad45 SHA-1: ba0eb4bcffe61fe88a7ff01a59e72c81f9bd89e7 SHA-256: cd336cef8326fc709ef8a224998f96ccc166ab997fa5f5669f5a496143f2ee1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, consistent with a link farm used for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=draw+signature+android PDF link annotation
    • http://lt101shop.com/userfiles/files/86739365910.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70738871954.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/2941135663.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tebatetuzupelomamopa.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/jarutoxafubaguxe.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/42349883496.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/38187743812.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/79684647701.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/viwigegipawasi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/soruropu.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29943985111.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/livekoxonaxokolurugakoma.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/64200531614.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/lifiradaveteposuzez.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/turajojekadupodiditunefe.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/33529648471.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/25262833659.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/gevewadipaminok.pdfIn PDF document text
    • http://haki.vn/uploads/files/75964568498.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/87128076526.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/75060584705.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/20202341975.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/38309698410.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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 10564 bytes
SHA-256: b01e83da1f04fa9720d6365ab9568de95aa0da39012bf61eb9721957231afe5a
font_01_sfnt_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16224 bytes
SHA-256: 6155d58fb08fb6cd15a7912e733574f8e7d3b590e2afcba25fc0eee86cd44acd

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