Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558878b364bcbc9…

MALICIOUS

PDF

89.2 KB Created: 2021-03-19 21:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0c23fca7ad27be99b2440f975fa6e5a SHA-1: 97835e3b64c85192b41579b2f3e659513b3dfce0 SHA-256: e558878b364bcbc9c6a04776d010dab33368359639e18abf29bf1c919e7fe852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or redirection scheme. The presence of a 'Download Now' lure further supports a malicious intent to trick users into clicking potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/wix?keyword=holt+california+physics+textbook+answers
    • https://cdn.sqhk.co/zumufapofow/SwXicge/stickman_hook_unblocked_for_school.pdf
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/gebalexojorazudatama.pdf
    • http://delaem-sami.online/315257117798ifn6.pdf
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/7478c21.pdf
    • https://fevujuwevu.weebly.com/uploads/1/3/0/8/130813851/8c90a697c622.pdf
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/757372.pdf
    • http://6gusevshop.space/vusatuwsp8.pdf
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/jelulu.pdf
    • https://ronudinogem.weebly.com/uploads/1/3/1/3/131398573/0168a6aced6.pdf
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/legesujulozid-xomuvafalaj-lujimen-topuwikazu.pdf
    • https://cdn.sqhk.co/vopupevomate/eVijhh3/44313415627.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sozejegisiwex.epizy.com/42362086610.pdf
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_dcbe6c0732aa451a8f79273a42a4d79e.pdf?index=true
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_57534e2fd07f4ab08fe909ef2c9118fb.pdf?index=true
    • http://zixoridepub.rf.gd/erosional_landforms_of_running_water.pdf
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_3e79a911fde044e79f7cd229dff6cf46.pdf?index=true
    • http://gijomifede.rf.gd/tiwibupuzekaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010302.bin
fe17f3ae7d8494a1a4bc7bec0c66ee9a5294c11afd6f72c19da098fe0b74b921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 5528 bytes
font_01_sfnt_off000115e0.bin
c7bae084e02781ee382d20e48c18c3f9eb9d1cf94a7ff2dadb20ce19d1a958d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 13432 bytes
font_02_sfnt_off0001420f.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 16204 bytes

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