Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e540fbc03dc100…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 08:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7772827d786578c854531ab617821c1 SHA-1: 8933d9138841336eb376ae34b59c488c35d55f4b SHA-256: 44e540fbc03dc1001e8e181aba8b2fc4ba00291be0b7b4218b7801ec2b415e49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various PDF files, likely designed to obscure the true malicious destination. One URL, http://alnadaoil.com/userfiles/file/52132441594.pdf, is directly associated with this link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://alnadaoil.com/userfiles/file/52132441594.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/78600534258.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/80119037372.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/xusoberotarorigabun.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rodinomawaminevuwokugefez.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/43855331564.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090105482340.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/28271996403.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/67162074933.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/fumodowadirek.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/ruwoxevuku.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/mapinawubitezoso.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mupidutumek.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/67300670317.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/gugokoxaf.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zasuxebatovaxuwole.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/84006704238.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/17193175850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+bluestack+app+player+for+windows+7+32+bitPDF 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_off0000ae78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 11488 bytes
SHA-256: 57801f5606f5d3e9929ff6125f601b338feada204700d99116c24b55892e7849
font_02_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 15888 bytes
SHA-256: d2a2afe0e64d62b51a00bf1566f539477a2f2102c7e76179d15f03ea0cb1e7f3

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