Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a642f95a7b71524…

MALICIOUS

PDF

76.7 KB Created: 2021-06-05 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a141f182a7aaf63775eefda50bc971a SHA-1: 71adbed389a2535ff95d27f914649c84020a9182 SHA-256: 2a642f95a7b71524a515ede2590f1aafa16d9ed25c0313976c4ae7c8ee7799a8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/pbw?utm_term=what+does+builder%2527s+club+do+in+roblox PDF link annotation
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/7247172.pdfIn PDF document text
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/zagezuguxip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5fc62eec8db18.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/3100525.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/7382189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_60ba5c3b23c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_606bceb85a03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6059e51b80001.pdfIn PDF document text
    • https://ladeletoleworuw.weebly.com/uploads/1/3/4/7/134712388/lasaxewimex.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/losilemupakubube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_6003a664665ab.pdfIn PDF document text
    • https://wesiravanenuje.weebly.com/uploads/1/3/4/3/134385991/3809903.pdfIn PDF document text
    • https://jonasajikisewo.weebly.com/uploads/1/3/4/8/134855139/kojoka_tafex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fe7eaa8c3fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_60604c3942bf1.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/dizode-napomosikinez-fuves-kixebolej.pdfIn PDF document text
    • https://lodonukatozusa.weebly.com/uploads/1/3/1/0/131070116/mugifikesojazu_feguz_xiresowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadoposapat.pbworks.com/f/how_do_you_write_a_letter_of_interest_with_no_experience.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144508959/80928361330.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144544371/rejanatamatofurib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07933097-eed0-4d37-be98-b9d24ef6f0ed/what_chapter_does_jack_hit_piggy.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/w/file/fetch/144620214/the_millionaire_mind_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e831209-e78e-432d-a852-3d8043e1fb92/19162000465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168bbd8a-cf70-4bad-9766-8e6af6abd437/what_is_bank_address_for_wire_transfer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d29203-b6a4-4d27-8657-3fa62841765b/67102020058.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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5284 bytes
SHA-256: fff0bd5aea9c960f86d6ba2cd2a5d6f203f93200a301720b29e8105fd7fd6764
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 11000 bytes
SHA-256: 2e48bc51567684638ef8cc14c8006ee59fc6047a0bca241fbae088f8db74e42b