Malicious PDF — malware analysis report

Static analysis result for SHA-256 04eb28b1394c01c5…

MALICIOUS

PDF

72.4 KB Created: 2021-03-23 08:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90aba52593a11360906820294dde42fe SHA-1: 8951e977f925df32bca017a28140562f9dcffa4c SHA-256: 04eb28b1394c01c555b1684b94b8fe4e760f6ddb5eb578b6cbe51654af16a9f7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'resalured.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or hosting malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=amman+image+free
    • https://nojenekaxaxi.weebly.com/uploads/1/3/4/0/134017841/0009510b696a55.pdf
    • https://cdn-cms.f-static.net/uploads/4388620/normal_603a2937a63c9.pdf
    • https://pasirukeb.weebly.com/uploads/1/3/4/0/134017476/41425e1a541140c.pdf
    • http://sekelenogake.getenjoyment.net/9771683768.pdf
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/3889689.pdf
    • https://cdn-cms.f-static.net/uploads/4452374/normal_604e5684e5fa6.pdf
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/vegizewob-firalezafisigo-tofupilosutafox-bexaf.pdf
    • https://dotepeguga.weebly.com/uploads/1/3/4/6/134684910/5682905.pdf
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/gojesevosepado.pdf
    • http://nurigoluda.mygamesonline.org/69497689308.pdf
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/juzebojabale-ranebubakafa.pdf
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/kizivakavoxipaba.pdf
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fd877008382a.pdf
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff8a1671082b.pdf
    • https://cdn-cms.f-static.net/uploads/4410976/normal_603d835c3b642.pdf
    • https://cdn-cms.f-static.net/uploads/4413242/normal_6054bc0635b84.pdf
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/1583873.pdf
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5ff24c32396e7.pdf
    • https://sazujusa.weebly.com/uploads/1/3/4/6/134632778/a6957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupovobejanam/zokerudesebukidegaxe.pdf
    • https://s3.amazonaws.com/pirosisob/google_earth_map_offline_free.pdf
    • https://s3.amazonaws.com/marimejerebo/97302623272.pdf
    • https://s3.amazonaws.com/luropiw/insulin_regular_davis.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_off0000e08e.bin
e2eb593cb4c148f1011923df95118f50ee13158ef62a3cca7110f5f890f290ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 4864 bytes
font_01_sfnt_off0000f107.bin
4490d64a9c5881cdd2dbb4bfad0f1f323691f6f706b53fef1add35e3024d8d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10416 bytes

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