Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f8bc98b459554f…

MALICIOUS

PDF

87.6 KB Created: 2021-03-27 23:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71f0441140773b98ca9531943fcbae20 SHA-1: 20c3bc7a09c8ccd8cba6127919a0f844a948419e SHA-256: 93f8bc98b459554fa915f3b81b07dc9b18e0d177afb832708780e5ac9dbfb0b3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/123?utm_term=how+to++java+jre+1.+6+0_11 PDF link annotation
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/sebuxijax-nikexesi-darutetuwaboru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_6009638a0f0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_5fd2d3e073e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_60224f02e81aa.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/lenedu-xexodudene-pivusuzog.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/806767.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/0jjNeSl/download_brasfoot_2020_registro_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_603319573d960.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ifGejfw/88129005459.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/fO8pihp/58420608778.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/cjbu7ig/stupid_zombies_game_download_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/MxheQgc/werilasanekorola.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/jhGmNIn/febifaloroburisijexuloxof.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/a6Nihgf/subuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3491c55f-27e3-40bb-839b-e55f5d2a6f06.filesusr.com/ugd/d14465_e2a96598fdd646a982c75667a82dc4b9.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_ff939b4922f14b9aa305c0ec80378fd7.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_144e9d7cc4c14d56af6f1f0b86b66f0f.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_0b0a729685374569acada99e200905cb.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_ef09923f45014c0aa986bc7f0754ba60.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_1bba4fa438d54e32991ae4b61eafe66d.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_5db2a43a590e4374a7995275f1078e88.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_5fa6f7d21daf4659bd902c0eac003523.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 10720 bytes
SHA-256: 9216168d1c9ccd45ae78da03540d5e553f11fc1fd243ac38dc7bd14c206e4743
font_01_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 4704 bytes
SHA-256: 33a799970189c97b48fc0e4920e01276839466033c78242c6232c3d8406a4295
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 11820 bytes
SHA-256: 41fb3024e66a351c0aa990a2e20836b192135026b447ab58546a1f5aed4b8686
font_03_sfnt_off00014271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14271 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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