Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cafd7ade19d339…

MALICIOUS

PDF

100.2 KB Created: 2021-02-24 07:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 400a059471eac6583ee2a03c8f81d66a SHA-1: 5426cb70a997dc03fea3a483552584dcf1d5a511 SHA-256: 30cafd7ade19d339538ea3c528b634b321dc757731bd63c532cb217763717b8f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least 30 identified as part of a link farm, suggesting an attempt to redirect users to potentially harmful content. The presence of a link to known malicious redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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/strik?utm_term=are+the+halo+books+good In PDF document text
    • http://micrometer25bill.site/amcrest_view_pro_softwarebhw3c.pdfIn PDF document text
    • https://peminikagi.weebly.com/uploads/1/3/1/8/131856713/zebosewoges.pdfIn PDF document text
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/5898332.pdfIn PDF document text
    • https://xetebozeb.weebly.com/uploads/1/3/1/8/131872130/nigelimubajotez.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/4032262.pdfIn PDF document text
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/8c15f6.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/5074419.pdfIn PDF document text
    • http://clientbluebadge.com/puwalogarud4np0.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/ifjcugi/red_sun_rising_bandcamp.pdfIn PDF document text
    • http://jiludedo.iblogger.org/18840775085.pdfIn PDF document text
    • http://bet-info.ru/jurnal_morfologi_annona_muricata0c998.pdfIn PDF document text
    • http://metalllift.ru/neha_kakkar_songs_new_downloadbkvh3.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/2352024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuriromaruwo.epizy.com/scratch_2_for_ipad.pdfIn PDF document text
    • http://fizufanotujo.epizy.com/short_formal_dress_patterns_with_lace.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/intellij_format_code_remove_empty_lines.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_off00014ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE0 5280 bytes
SHA-256: 663ccd9cf3fee844df24636169fda19ded742e71abade0ad6acedbadcc15c1c7
font_01_sfnt_off00015ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC6 10716 bytes
SHA-256: eb9d4a29be7a138e4e8c028e0bd71e048e4d15f5c77ef9a2854f7b9762b8d661

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