Malicious PDF — malware analysis report

Static analysis result for SHA-256 92571c908c72e4b8…

MALICIOUS

PDF

87.5 KB Created: 2021-03-15 07:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a260bdd879204e68895e9ce87777e4bd SHA-1: 95bb3a9c643985d6b11ccad0c7791ed490424605 SHA-256: 92571c908c72e4b836398e6ad4be4a898cb9b8bc94ce2c8288751456c39857ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of an SEO link farm designed to direct users to malicious content, likely disguised as a free book download. The embedded URLs and the PDF structure point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=creative+visualization+pdf+book+free+download
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/nigibakadinikosav.pdf
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/fazixa_zonozab.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_60017307de417.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/nimerideb_vebeku_befopesev.pdf
    • http://sajitalunaded.22web.org/532149934.pdf
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/wivenekitumutupa.pdf
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fef648666428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_ddc9bcc8463a48d8ad2b647f9bdc187c.pdf?index=true
    • http://suziben.rf.gd/nukiwima.pdf
    • https://uploads.strikinglycdn.com/files/56b9b820-b860-48fc-a3df-9a1bdafe7695/pidusivamotabipupofe.pdf
    • https://uploads.strikinglycdn.com/files/ebc13595-8a0d-4387-847d-5c111906fc34/76484666681.pdf
    • https://uploads.strikinglycdn.com/files/894e21bb-de14-4e3d-981c-0fd9e82638db/61932256493.pdf
    • http://boludit.rf.gd/37388712722.pdf
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_b28b34bb6d6a4ce5b6cfa5b8cbaf7807.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e739133-0ac1-41de-b8d4-a006bce6414d/jizetojasaga.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_7dd808b8f3be43ef80ecabd4b4f79e52.pdf?index=true
    • http://nimuwoke.epizy.com/montant_amende_cas_2_bis.pdf
    • https://uploads.strikinglycdn.com/files/e2c00196-6cc2-4f0a-8a5d-43ca6fd804ae/blue_iris_app_notifications.pdf
    • https://uploads.strikinglycdn.com/files/0481fdb1-b4aa-4f51-a2a9-d47ef638674f/66738329725.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_733004efc6094d7e9b7cc05da1d2647d.pdf?index=true
    • http://bolapapuziku.epizy.com/84364336014.pdf
    • https://uploads.strikinglycdn.com/files/2363a792-e8b0-417f-bb0b-d3090e1afa2f/taotao_50cc_four_wheeler.pdf
    • https://uploads.strikinglycdn.com/files/3af41d9d-c336-4805-818f-814eb97952dc/texogafofabolesix.pdf
    • https://uploads.strikinglycdn.com/files/568f0f3f-5325-4316-aa33-ca03aa9a82fc/limidisudojajilizejulodu.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_046cb20e8b594d5dbfff3608496c74b1.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d0.bin
b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 6548 bytes
font_01_sfnt_off00010a26.bin
b39d3b23d857d6c2ef3d8d712a5dd81202a5c9f125d331cbe9de1670fc7ffe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 5344 bytes
font_02_sfnt_off00011c75.bin
31f3e4ca5eba5664134e4660dfa1c16adde48f3a4b88c4fdf073a661a215a76d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10712 bytes
font_03_sfnt_off000140e4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 4324 bytes

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