Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b11970a0efa57f…

MALICIOUS

PDF

74.2 KB Created: 2021-02-19 11:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f83efedfa43cb2a9dade1fea1b637070 SHA-1: 688ccdbf0488cf7e30e8bb020a2a8495f5cd043d SHA-256: b4b11970a0efa57ff114e84f74d9a4b72d42b9e254451d31081f4a7859010912
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary external URI points to 'jacksth.ru', which is presented as a search result for printer ink, a common lure for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/123?utm_term=hp+photosmart+c3180+printer+ink PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428069/normal_601d0d5926998.pdfIn PDF document text
    • https://cdn.sqhk.co/dazibewibu/jgyeiai/vunoporelexur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_600bd1a596f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fd98fdb2e742.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/haJ0Xhb/74533620959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fe0ddab8e0a5.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/769612a257369.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gjhbjci/sifowudibuwuja.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jbZTy33/ocean_rift_megalodon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukorokibenej.epizy.com/bedara_kannappa_kannada_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/51475542859.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/motor_briggs_stratton_3._5_hp_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5720 bytes
SHA-256: 91027b01e171b5097e35cad3ae82caa3a5c2412a70c4bf6a7a5566adebb508a6
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10240 bytes
SHA-256: dc2b6320ba3c779ecc10c386614083d448dd17a123e871d446bfbc9f680b5d8d

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