Malicious PDF — malware analysis report

Static analysis result for SHA-256 6453f419aace8f00…

MALICIOUS

PDF

67.3 KB Created: 2021-02-24 09:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c7a2a34fdcf524d2bb565c0b62c352e SHA-1: 97d5e4a5e79d3b26eb0140da724581c3f39b35b6 SHA-256: 6453f419aace8f007087a6bf3131011ab4264e8f9c31eec418338cb8bbc32fa5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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/wix?keyword=beloved+pdf+novel PDF link annotation
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/ziwigamufesabewaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6017f7c82570b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476927/normal_5fef47adcc813.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/tojow-vagukawabesudon.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/tosipokizokatibe.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/papizitufos-remaw.pdfIn PDF document text
    • https://vevatujiv.weebly.com/uploads/1/3/1/4/131482893/zuwudunutunapavibef.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/rubepetusuji_saxopuguzufokax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fc9dc33291ed.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/02852a0e8d6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulilidason.epizy.com/bulolobovijexidamixida.pdfIn PDF document text
    • http://bezegorev.epizy.com/renerutimoxiwakakop.pdfIn PDF document text
    • http://ritanuwo.epizy.com/27484395777.pdfIn PDF document text
    • http://pojifatuvu.rf.gd/lexmark_ms811_imaging_unit_reset.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/aankhen_movie_video_song.pdfIn PDF document text
    • http://timevexow.epizy.com/ringkasan_belanjawan_2020.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_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 4660 bytes
SHA-256: cabfedc7a3fe4192e896b8ee726ec1390eb7506f88db897ebd0a476cfe15e76e
font_01_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 10412 bytes
SHA-256: 14341a5163680c3f4433ac3553a57fd0552b96dc8d38c0177bdb61b5af67682c

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