Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5268d2e5476aad3…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 02:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf22edc042691b958a31e8045920b80 SHA-1: db3d59e7f021901c8b3315e7febfd887cdc077fb SHA-256: e5268d2e5476aad3f9de8b6a2d712ef22e9341e2fcf07416a7867752b435d58b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated for SEO purposes, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+add+layers+in+sketchup+2020
    • http://tifusavegapawuf.mygamesonline.org/zezelijiki.pdf
    • https://cdn-cms.f-static.net/uploads/4409250/normal_600fa13f183e3.pdf
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5ffba955b5ede.pdf
    • https://sanulatoz.weebly.com/uploads/1/3/4/1/134131282/zavojajik.pdf
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/gafekasel.pdf
    • https://cdn-cms.f-static.net/uploads/4529893/normal_601b3f47ac086.pdf
    • https://cdn-cms.f-static.net/uploads/4373782/normal_60343d3e5439b.pdf
    • http://pakirekugep.scienceontheweb.net/terry_pratchett_wyrd_sisters_movie.pdf
    • https://cdn-cms.f-static.net/uploads/4392191/normal_6034c1bd0b929.pdf
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/fodogubud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_2f227c2eb6f547429e151b9fe2280d5c.pdf?index=true
    • https://s3.amazonaws.com/widiku/nogiw.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_1b4638d05adb40a094d010eeeeb0165d.pdf?index=true
    • https://s3.amazonaws.com/xaliwalufoguni/report_road_accident_online.pdf
    • https://s3.amazonaws.com/novipaliwid/96824320873.pdf
    • https://s3.amazonaws.com/xulepiwa/cummins_india_ltd_annual_report_2018-_19.pdf
    • https://s3.amazonaws.com/nokiva/bobefoxazapot.pdf
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_87b6d3fa71b74e1b86e047d60307b18a.pdf?index=true
    • https://s3.amazonaws.com/jolituzoji/agile_configuration_management_plan_template.pdf
    • https://s3.amazonaws.com/legobegutulo/lepuwinatowomojetojo.pdf
    • 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_off0000f72f.bin
b2ebfc03871b1995daee8f28264cd0339173a4487a09f373f73a51cfcfbf6ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 5652 bytes
font_01_sfnt_off00010a7f.bin
06a0b7047272c6c23f44885bcaf69f44689edc4f7b69052775b13a948ada4a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 11116 bytes

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