Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aaaec3af341e08…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 16:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be76536b989344a158686ac1e0d1ad51 SHA-1: c4db3d3280bf7745a698151299e7ab1f35f589d8 SHA-256: 64aaaec3af341e085e8fc4feae0caa28b325b7aabb85a7560803900ac830f57c
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cochemical.com/upload/files/walolemevav.pdf In PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/nolimodufuxukajabifax.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/revixizexasop.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/popaj.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/roselotaj.pdfIn PDF document text
    • https://asiapharma.la/files/files/78910063913.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/vegorerikoxokakilosuxot.pdfIn PDF document text
    • http://taigesw.com/upload/files/8348978417.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/kabasigitelika.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848343dce1---68546625474.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/bevab.pdfIn PDF document text
    • https://onlinendttraining.net/files/52951236453.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/86391763628.pdfIn PDF document text
    • http://mq-water.net/upload/fasaxibefepetipopafejal.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/domuvudebonadopixexi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a9ee6223---zofapigoveropezumenepure.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bigedisikogekumugafibera.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/76027805732.pdfIn PDF document text
    • http://dezis.ru/uploads/files/21493203202.pdfIn PDF document text
    • http://szwygs.com/upload/79739496710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kakamanga+app+androidPDF 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_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 10372 bytes
SHA-256: 027d5e91ab6109e5d31a734cdc01e5a06af7126df6de94226c59f71cfc76e844
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 18540 bytes
SHA-256: 9853f8112d80b8d7d370bd08983beaa29c392ee0372f75e4ce3ca1cab61f2581

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