Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cd40892e086426…

MALICIOUS

PDF

79.3 KB Created: 2021-04-03 05:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b57e9e7c21d6aaf0a96be96c704b61 SHA-1: 287e075acacb91e8a5e3e407457e90c5b862522d SHA-256: c0cd40892e08642683acc750116ffe9d772b9d9db51364cdc7763da36076641f
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting an attempt to drive traffic to various websites. One of the embedded URLs, "https://ponafet.ru/123?utm_term=sql+convert+int+to+string+format", is directly associated with the document's apparent theme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://ponafet.ru/123?utm_term=sql+convert+int+to+string+format
    • http://pewujok.mypressonline.com/academic_vocabulary_test.pdf
    • https://cdn-cms.f-static.net/uploads/4385204/normal_606547091d81f.pdf
    • https://cdn-cms.f-static.net/uploads/4499309/normal_6041bfb5e938a.pdf
    • https://cdn-cms.f-static.net/uploads/4455179/normal_5fd94494c3906.pdf
    • http://jekeluxuto.mywebcommunity.org/who_is_god_street_spirituality.pdf
    • http://lupelisizi.medianewsonline.com/que_es_ficha_tecnica.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavobawum/destroy_the_opposition_free.pdf
    • http://lijomoxanegug.rf.gd/15106828534.pdf
    • http://wovowevajob.rf.gd/34949023902.pdf
    • https://s3.amazonaws.com/varoximu/2000_yamaha_kodiak_400_parts_list.pdf
    • https://s3.amazonaws.com/gurafoga/31099932634.pdf
    • https://s3.amazonaws.com/zowibatev/gusuwal.pdf
    • https://s3.amazonaws.com/vuforewebub/how_to_change_keurig_filter_replacement.pdf
    • http://mojilozijidula.epizy.com/surface_tension_by_capillary_rise_method_experiment.pdf
    • https://s3.amazonaws.com/zalisujezajaje/sowozos.pdf
    • https://s3.amazonaws.com/wowonesoribu/13552917771.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_05e9a4acb7a74ecb9518a944d0bf28da.pdf?index=true
    • https://s3.amazonaws.com/makixibawumebol/conference_of_the_birds_story_for_children.pdf
    • http://vavoxixe.epizy.com/nukulosifupoledulo.pdf
    • http://fonenutekosut.epizy.com/gupuwifawa.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_9dd756ea541040faaaa985664dd46827.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_off0000f831.bin
ebc94ee547b705f6f8033d485126d6ea44b99efaf992179653aa66a8745120e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 5492 bytes
font_01_sfnt_off00010ad4.bin
ddff2a8126667acd886eccc3f226439c9da27912688d6823ec967499149c05e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10896 bytes

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