Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a52c39c8cdc3d9…

MALICIOUS

PDF

77.8 KB Created: 2021-05-31 00:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1ce3972916bffc626b0c7e158f2b2c75 SHA-1: 90e28f1d2af7a7e51c3f5a8bb9c8613f4c424b3f SHA-256: 47a52c39c8cdc3d9b354f1d57ae6daa242c419c511f16f8f7cdbd7f71a75cca1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of luring users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://golowaki.ru/strik?utm_term=introduction+to+old+testament+theology+pdf PDF link annotation
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/nomafex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6044a094ad407.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/9533040.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/wupimepufabage-ligilirudeje.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/8055890.pdfIn PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/wufafuwelexemesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5feef0e8e81f3.pdfIn PDF document text
    • https://fosezuwupilure.weebly.com/uploads/1/3/4/1/134132817/leronokola_nujat.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/pikepetako.pdfIn PDF document text
    • https://sojisesoto.weebly.com/uploads/1/3/1/4/131437607/249de780cb2f37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2031897e-c545-4713-af31-738783b8b984/38115322350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a6a0a3-d88f-4216-b193-902b769fc3d5/lg_tv_not_connecting_to_bluetooth_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08fa427-3805-4595-a0ed-76602fef606a/peerless_transmission_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef03ca8-dfdb-4537-a358-8ec8fa3b96dd/sexidulixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b32d2c-6774-485c-8aad-aeb6716cc757/lunarawajoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9e61ad-a79b-460c-8968-738079a52955/simplicity_broadmoor_hydro_14_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc3055b-8838-496a-bbaf-e3359a812d8c/how_to_open_timex_indiglo_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2a8a5e-afe9-4123-81e2-d4d6e5556531/how_to_reset_honeywell_th5220d1003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81edf65-49b1-4c0a-9a73-bdfd20e346a1/vogadezedokidena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7b47fd-65dc-48c2-b3b1-b71ba2458860/zagg_rugged_book_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2a4513-ec85-49dc-b606-356165d4b3dc/clash_of_clans_hack_private_server_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1b3310-ef83-4343-a771-78ea1720db6a/47579573452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe64aca-093d-4a6c-a50a-3c22d3c877b5/how_to_calculate_uncertainty_of_measuring_cylinder.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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 5608 bytes
SHA-256: c13d2aabfb123107d30c0c08c86084cfe732530f7bdadffbb9da421939a33f0a
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10676 bytes
SHA-256: c4effc1c99f2657d5e494780ea675d52ba38499595b0c2183f9d281cb235f7d5

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