Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a12966cab2e1a39…

MALICIOUS

PDF

110.8 KB Created: 2021-03-01 15:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4c9ea91d7d106ffefe02b915862b62b5 SHA-1: d01cef6661a05e295cb167311bd8ea4d010ada12 SHA-256: 3a12966cab2e1a39c89ef71b6f56b5f2680fdf90d3dde6f6a85b44116a936865
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors or disposable hosting, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS', strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=call+of+cthulhu+7th+edition+book+list In PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/6efb673597535ec.pdfIn PDF document text
    • http://pojegan.22web.org/58905165349.pdfIn PDF document text
    • http://zazubabifuwor.iblogger.org/invisible_influence_jonah_berger.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/moweberepizafo-puzev.pdfIn PDF document text
    • http://leoidet.xyz/rosajowinopupufeledab4keam.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/properties_of_water_lesson_plan_high_schoolgn2a8.pdfIn PDF document text
    • http://sparzha.club/cultist_simulator_achievement_guide6pgfl.pdfIn PDF document text
    • http://buylettersonline.com/10000_reasons_matt_redman_mp3_download86ebm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofirutu.rf.gd/43390718140.pdfIn PDF document text
    • http://dozokefonusabo.rf.gd/22227635733.pdfIn PDF document text
    • http://pifazudiso.rf.gd/50788655360.pdfIn PDF document text
    • http://xowitulodif.rf.gd/62528210395.pdfIn PDF document text
    • http://resifukizuve.rf.gd/93281627887.pdfIn PDF document text
    • http://lajefuvubesij.epizy.com/68261482338.pdfIn PDF document text
    • http://gobozukelawi.epizy.com/57729064086.pdfIn PDF document text
    • http://pimogajen.epizy.com/dezamefejeleduwete.pdfIn PDF document text
    • http://tupemovon.rf.gd/30828019787.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_off0001708a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708A 5200 bytes
SHA-256: a0dcd9488c5595c1c42a4e388f1bbe3478b79f301ed550155fcf4e9a5f5adef9
font_01_sfnt_off00018240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18240 12920 bytes
SHA-256: 92a5fb17b6bfb73ddc7b783edfcc20fe0349741e7a279e900f9cc375a79448a7

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