Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44f89eff5c1d86e…

MALICIOUS

PDF

103.3 KB Created: 2021-04-28 04:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffcca1f01a031b770078b856b95f940 SHA-1: d3dee565172c37645ac81c17bcafa9bd6bab70d0 SHA-256: f44f89eff5c1d86e003475ae9c03cb41b9f8f730de528f2022a0bd1505ed01fd
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 pointing to other PDFs, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=verbal+reasoning+example+questions
    • https://cdn-cms.f-static.net/uploads/4501367/normal_606952724c03a.pdf
    • https://cdn-cms.f-static.net/uploads/4371787/normal_600d8abae8f11.pdf
    • https://static.s123-cdn-static.com/uploads/4445736/normal_6007b9fa5d286.pdf
    • https://cdn-cms.f-static.net/uploads/4427793/normal_603afc5ca5d4d.pdf
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5fef67aa1f817.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_600b4cba8c1e0.pdf
    • http://gimatadokij.mygamesonline.org/xifirikerexij.pdf
    • https://cdn-cms.f-static.net/uploads/4480412/normal_606ca3a822d44.pdf
    • http://xafopawiki.medianewsonline.com/gasofagapowuwupenugiv.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_60242c3bad1c6.pdf
    • http://jovopomutulilo.medianewsonline.com/mini_dv_tapes_walgreens.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_602931ac4716f.pdf
    • http://sozawakofuriwoj.getenjoyment.net/morijoguluvaguvurejir.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_6017756b76812.pdf
    • http://tebogekememesij.mygamesonline.org/pdf_book_on_marketing_research.pdf
    • https://static.s123-cdn-static.com/uploads/4425484/normal_60052fa1d3266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_33801dd27d4347b693c06ddcc952219d.pdf?index=true
    • http://jalebuvubo.myartsonline.com/43851037973.pdf
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_e8c49589fe6b422b8f34916d231b936c.pdf?index=true
    • http://tosurok.myartsonline.com/limadapanefebanagogusigu.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_315b0fe1f79b400c98a46d11b78a0a6e.pdf?index=true
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_64332140569a4f20a007aa62796085a2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015222.bin
66c61d3663ca5566b6c747f92e232531e3e0d64cc09aaacacb1b3260107b1a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 5440 bytes
font_01_sfnt_off0001648d.bin
5d43191d7ceba50f39026a453a887d7ea8f61fb7b73ee088699660a38af7a059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1648D 12980 bytes

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