Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb46e98fe235df2a…

MALICIOUS

PDF

87.4 KB Created: 2021-05-11 06:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c16eabb7998b655c7a6d8d459be48aff SHA-1: c6f4999b0f8875f45989ed2019bd596eeae58a14 SHA-256: cb46e98fe235df2af49dc24366dab3429984f0b550df3239da3c9ba482455941
186 Risk Score

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 0.9996

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://lozipotod.ru/strik?utm_term=dyson+v7+trigger+user+manual PDF link annotation
    • https://tafulagi.weebly.com/uploads/1/3/4/6/134608062/fbd050c132ba43.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/jaketadowosam-xorafuwujofoxi-lepugaxoxezara.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/7e4c33d.pdfIn PDF document text
    • http://caterm.ru/11458283016jh21r.pdfIn PDF document text
    • http://lesuzod.iblogger.org/wika_gir-_10_manual.pdfIn PDF document text
    • http://lalashoppen.online/antioxidantes_20176pp77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_d1f6369eaf2645c198b800239645bed6.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_7058b7dbd60c4bc2bd63ea9aa6ea4bbc.pdf?index=trueIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_b20c73a97ca949128a5703b55b6fd513.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_9563ddcff61f482c845cb21722a5289e.pdf?index=trueIn PDF document text
    • http://riwexakax.epizy.com/95285187404.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_c16c3feae273425092f2be9f1bc45b73.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_fad802d61baa4e01bba64c57e7cbfd49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satudifin/bafonegaxetugutumek.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/neduwi.pdfIn PDF document text
    • http://jikirukuda.rf.gd/narrative_policy_analysis.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5244 bytes
SHA-256: 7fb0e017d5877e1d1581ca10cba0c8b6b9eb8fd1e67eec1555a06c2b1ccc0fba
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 2168 bytes
SHA-256: 8652522a46fc63549263a47128acdc6684b8539d0d6665d52a1ad3b8b2db464c
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 17700 bytes
SHA-256: 8b17deeec7914b53ea7b66d434e7f3a98c0b159ae98aac3f015e6b21ab73e9a9
font_03_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16348 bytes
SHA-256: 21c0582d17e48c54c04660f311f62ae3cab4a420171890737e1390e0da9ef214

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