Malicious PDF — malware analysis report

Static analysis result for SHA-256 c692b54bb33c6bd2…

MALICIOUS

PDF

68.2 KB Created: 2021-04-04 06:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7cd1d44ed59d5b5bd3850662f007a62 SHA-1: 8b00bc8cc274b337392db357d372fdfacffd8c48 SHA-256: c692b54bb33c6bd254fdb4bfc3a86791d1aade18737bdddf1a3d56fa89036deb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://druttle.ru/award?keyword=textbook+of+biochemistry+by+vasudevan+pdf
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/zovoz-zuperomu.pdf
    • http://kigaruzolalo.mypressonline.com/zugixefito.pdf
    • http://povar2020.site/draw_a_stickman_epic_2_walkthrough_level_2syzhx.pdf
    • http://zodimasar.mypressonline.com/here_comes_the_bride_violin_sheet_music.pdf
    • http://fexuvukenix.22web.org/sibokiwaxupujijelarafew.pdf
    • http://bebalezuve.medianewsonline.com/74086949874.pdf
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/duloxatudom.pdf
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/cbe00f8440.pdf
    • http://fisujerekuvij.getenjoyment.net/91212333671.pdf
    • http://fruit-italy.space/monstrous_example_sentencebd68o.pdf
    • http://kelnoteres.xyz/purorurir92bhh.pdf
    • http://lisolu.org/gupuvavuvoneraforijapp2v.pdf
    • http://lovewaits.ru/ancient_civilization_persian_chart78a38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_851b62730162449baa8540e914d58cce.pdf?index=true
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_063fa64aedf243d5a1b01b7859b67a7e.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_00d73aea7d014472b8a1eb443dabef3b.pdf?index=true
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_d1936903fec246bd8056b6bb8bddc85d.pdf?index=true
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_2f0948dc47de44f29ec944f92bc4f778.pdf?index=true
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_e6b0b995d71f4f3a98e2fcb6144a5961.pdf?index=true
    • http://jozobudesurarab.onlinewebshop.net/wusepu.pdf
    • http://lemopuzawematex.rf.gd/69844183739.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_f4217a0a81814050adbf8d066d2ab2d2.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_f9846ba859504adbbf2352e0c4da4502.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_f10b19feaa534979b1d4f7016a2a0799.pdf?index=true
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_4c3903ec0ca048a7a9b6612bcedc7653.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1f.bin
e4834e2a4f21595b4d2ea0ebb6ce223489bf37bbd0810465dcf88cae641065f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 5748 bytes
font_01_sfnt_off0000e090.bin
7345f297296f4343edda557e8069e4d5393e1f0215ccb6dcf5fba191a13e0efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 10180 bytes

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