Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe755d09647d1b1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 09:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a36683aad93f9523ebbb6e792052a08e SHA-1: 2d5fc3b0efbd6167dd285de66835e5a8d24767b0 SHA-256: cfe755d09647d1b1f6c39119615f849a447bfb0e5971ec98b09461f56627eca7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded URIs indicate an attempt to direct users to potentially harmful external content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=michio+kaku+books+pdf PDF link annotation
    • http://africalegal.nl/userfiles/file/52027312482.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/61123030350.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/29545005120.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/13960592546.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dologana.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/53536595393.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/zorunazif.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/90065374358.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/75471961282.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kafamuwogaletasijatez.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011438078900.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/16556472934.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/filijojemenafatiwabamof.pdfIn PDF document text
    • http://contextuae.com/resimler/files/99915614181.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/dakubuxadakimoleripiruwet.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109120212575375.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210914084407959.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/wuxabazusokop.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/zizukasinemag.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/burutegibubediji.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/50431330580.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/buzefirojajusajogupokatoj.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/35260293088.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4be4af5c3---46930484263.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95312585568.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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10560 bytes
SHA-256: fc2bf71fd338093a9be9280662835f31e25257684057f21d2e60dc4d795e8f63
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 17192 bytes
SHA-256: 31153daf1f4cb0dc3b611480e3575dd515ade94bdb043bd85109767f4c5e0e9b
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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