Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ddb160b5909da…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 11:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9844364e655ebff82f002e71cfc529bd SHA-1: 35818f9dcfcb2f62c0abf129639fa5c0c5012708 SHA-256: 9b7ddb160b5909da7854076ab80c1116f6d40fdfd8596c93d1a7f0ec4270589a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious domains, indicating a lure for users to visit these sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm, a common tactic for phishing or distributing malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=unhinged+streaming+fr PDF link annotation
    • http://csc-021.com/userfiles/file/20210920001037_e5o9jx.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/61104754877.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/65373459436.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/47458170030.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/tepopitobe.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/73312067464.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/rapurofevixi.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/40329205361.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/gigevovepoximabidabufis.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nofaruzibatemubaxorawuwo.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/13656499282.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/baxejamobafobadozubizone.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/pivalulajiporutazegadu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/75445898917.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9f675ef3---lurolagaxepezitetixurosu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/vubopu.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/44562235441.pdfIn PDF document text
    • http://xycrusher.com/d/files/88742790305.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/54144586405.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/87702217200.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/dirubutabenagerur.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/9186427676.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/37229140755.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_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 19596 bytes
SHA-256: 6406f641450c3a1c45ea98cfed695590d64d819d368ad979e0a41642bef9aeba
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10640 bytes
SHA-256: b6389d002b5a738a54781a10b5a35dd0c4aa0705e03c74826dd987d9b3d3dfbf

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