Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43fc7f53891983d…

MALICIOUS

PDF

68.2 KB Created: 2021-02-07 13:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 22e2a7b3d9b4929762a7646a9e0314a0 SHA-1: f0c06db0f914bae745cf179e7906b4b30135fcd0 SHA-256: b43fc7f53891983dcee3f4bbfada83da5501e0b2794d41984fe98903dcd84535
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 and an ML classifier. The PDF contains a large number of external links, many pointing to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary external links, https://jacksth.ru/wb?keyword=income%20support%20reporting, is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links and the overall detection profile 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/wb?keyword=income%20support%20reporting PDF link annotation
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/6294dc.pdfIn PDF document text
    • http://kadesevi.iblogger.org/22700007496.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/7899f4e.pdfIn PDF document text
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/butubigelas-pivasaro.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/9387005.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/98db6c3.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/diwetidalejurupug.pdfIn PDF document text
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/f3923384a68f9ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tazopaju/nda_2_2018_set_b_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/broncos_leagues_club_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/80019002147.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/vanilla_engineering_guide_elysium.pdfIn PDF document text
    • http://kupaxomuwekag.epizy.com/48560881679.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/62719824342.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/bollywood_movie_all_song_mr_jatt.pdfIn PDF document text
    • http://xatufagenis.rf.gd/horizon_zero_dawn_guide_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/vosemavurabuzedu.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_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 4948 bytes
SHA-256: 206097106760fafd5519c78ba709dce493d0083cbe32be44f27d648de65ac754
font_01_sfnt_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 10564 bytes
SHA-256: 6d41c51218a0ec9ec857da09460174f73004b17ba5224d5a6048369d78aa7b74

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