Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf1462738b2914e…

MALICIOUS

PDF

68.2 KB Created: 2021-03-31 08:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5e22b32332ad64e121dc54ef45416f SHA-1: 9ceca443656188df1b5debbf8eafdc5468a38841 SHA-256: 0cf1462738b2914e02e41654436399dbd4171bf9550acd54a4ce7b45ebe8e446
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' and another flagging an external URI to 'vilenefex.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=abortus+provokatus+pdf
    • https://static.s123-cdn-static.com/uploads/4459629/normal_5ff1c6e99d6fe.pdf
    • http://qwonder.space/cloud_computing_definition_in_computer_scienceb3exy.pdf
    • http://devgame.design/90026526252z5u6s.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_602a548fe2955.pdf
    • http://energytik.net/jegavemuzafipegu1qcq.pdf
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/tosejo-gejaleratu-mikewevefexuw.pdf
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602729915a643.pdf
    • http://korecos.ru/lotemocoop6.pdf
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/6235022.pdf
    • http://igafnd.org/38598013897xmeu5.pdf
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcf30a395e97.pdf
    • https://mapavafamaluri.weebly.com/uploads/1/3/5/9/135999294/lubusofodom.pdf
    • http://magnifioco.site/wirojatubobojugfkjm.pdf
    • http://bloodcraft.online/xurujarezibefiloc99ze.pdf
    • https://static.s123-cdn-static.com/uploads/4487432/normal_6003681ea5d0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/ring_doorbell_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/pukaridimupo/mesebexasogesosa.pdf
    • https://s3.amazonaws.com/wazotojemov/xodezosik.pdf
    • https://s3.amazonaws.com/gasodamuza/chrono_trigger_apk_obb.pdf
    • https://s3.amazonaws.com/vokeri/vijumemaviradaforajorul.pdf
    • https://s3.amazonaws.com/vifusupegiza/84248763520.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_off0000cdf2.bin
8510391f8213bb1c38583ac483034c33d414ceb5cb0dd8a4a269ea9c9c7d9f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 5256 bytes
font_01_sfnt_off0000dfe4.bin
257b261f42a11f2ffa409bec4588845050808913bcd1f535e1de2143d7644750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 10592 bytes

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