Malicious PDF — malware analysis report

Static analysis result for SHA-256 789dbf4696f2299a…

MALICIOUS

PDF

79.7 KB Created: 2021-05-01 18:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1e80e92369d3ad953783b1f772b5978f SHA-1: 43630ddca807865d261936c89b2e9fdf99026b5d SHA-256: 789dbf4696f2299acadbce7b6278ca7a07f28802a33ce9a25086e8dca719a1dd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://seumenha.ru/strik?utm_term=measure+theory+and+fine+properties+of+functions+pdf PDF link annotation
    • http://keksik24.ru/10121537131ybrvl.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/d79ff6.pdfIn PDF document text
    • http://ehaberdevlet.com/2020_civic_hatchback_manual_reviewy1pm8.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/57287229257qb7y4.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/sevanikerutat.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/gelazodeb_voramim_xutunuzafizur_xijifefoxev.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/5408e8f86ce7ed.pdfIn PDF document text
    • https://wonusawe.weebly.com/uploads/1/3/4/4/134481200/5069493.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/lukiki_piterobefaja_jezabonipalim_varexugoserip.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/xefap-ladupet-dedosulurib.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/8957876.pdfIn PDF document text
    • http://fuwakesesul.22web.org/duramutomiwiwoboxoz.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/5970747.pdfIn PDF document text
    • http://jovedarike.iblogger.org/hoist_the_colours_piano_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_76742ce1d8a840d2848f61cef5f8245d.pdf?index=trueIn PDF document text
    • http://tononuzaribiw.rf.gd/aap_urinary_tract_infection_guidelines_2016.pdfIn PDF document text
    • http://fipunagofalava.rf.gd/zepejisami.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_54f5607ff52d4a96b8dc81b120ea50d7.pdf?index=trueIn PDF document text
    • http://wivoruremuwun.rf.gd/strangers_on_a_train_book_cast.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_dc30b58f464a402886a1ac477dd7ca84.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_cdd2ce4d0be14415a48fd6929b7811f6.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_d419180454d6453e8c59940c9c8a698b.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_1c6902f0430242c4bf3996011218e754.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_7f6dd4bde4aa4e5192db4a90ec850259.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_859858c8d77b47ca8fe37d86223e7d9f.pdf?index=trueIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_7908930f59274162ab4778e396b6143f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5316 bytes
SHA-256: 8c96d7d0f2f1d7f765f17cab10ac5f7110a4341c291a029db38cba935e2f1e1c
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10432 bytes
SHA-256: 0e54a2054dc5988535eccad5b3241a5225b7f21b81257f9628a1983323f371c7
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16232 bytes
SHA-256: 61a1050370629c0049f499aa489956ece95f5ca3d14e9d01d2866429c244fb15

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