Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739c59edc3cb0f6…

MALICIOUS

PDF

71.9 KB Created: 2021-06-06 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c4b17f261bb4d78561b4e5288f37ce6e SHA-1: aa3eca01eff3e688deaea637aff3ea5a11c9b080 SHA-256: 6739c59edc3cb0f6283f48811a9c28576766715eab32dc52a78553dfb175e551
186 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO manipulation scheme. The embedded URLs point to various PDF files, likely intended to redirect users to phishing or malware distribution sites.

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://queure.ru/pbw?utm_term=how+to+write+a+team+captain+speech PDF link annotation
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/6538452.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/1280194.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/7529730.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/057f7.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/kogavasipoxuxa.pdfIn PDF document text
    • https://verorepu.weebly.com/uploads/1/3/4/7/134774070/bozenon-miwasu-gorigusigebope.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/a93657a12969354.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulatigono.pbworks.com/f/pokemon_sun_nds_emulator_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c80137-6627-4317-bc4a-62a1663c131b/29467117205.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/w/file/fetch/144686304/46069128869.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144418665/58265098320.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/how_to_build_a_computer_forensics_lab.pdfIn PDF document text
    • http://kegogaxevu.pbworks.com/f/mistborn_the_final_empire_online.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144416319/mopinutigazopasemojapawap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d300209c-3e8b-40fa-aae6-39237db4c565/how_to_program_honeywell_thermostat_rth2300.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144535650/dil_hai_tumhara_film_song_lyrics.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/vmi_cadet_handbook_2018-2019.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_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 5196 bytes
SHA-256: 8f4241186d803955df0957cf4ccf2228802f6e7e659fd3ee15202306ad80dc57
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10208 bytes
SHA-256: 03bb45dd6d3bf9ebe6a38eab348cd71bf56e0b01829bbf35f663c16588300954

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