Malicious PDF — malware analysis report

Static analysis result for SHA-256 279641656dbab6dd…

MALICIOUS

PDF

78.6 KB Created: 2021-05-29 05:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad8be8a19c2a672823879946dd91af0d SHA-1: b74332b8bd6167b3cc150670a7ff76648fb2915a SHA-256: 279641656dbab6dd6cae9b7280fb3d132786fb79426f2b98797a05654b842555
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and contains a link farm with numerous external URLs. The primary URL, 'https://jacksth.ru/strik?utm_term=best+canned+foods+for+survival+storage', suggests a lure related to survival storage, likely intended to trick users into clicking through to a malicious site. The presence of multiple links hosted on disposable domains and link farms indicates a phishing or content-redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/strik?utm_term=best+canned+foods+for+survival+storage PDF link annotation
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/d385911f7.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/7815191.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/aede63431ec6.pdfIn PDF document text
    • https://lepivigodegobuz.weebly.com/uploads/1/3/7/5/137505729/c65b1.pdfIn PDF document text
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/5474b.pdfIn PDF document text
    • https://sowalofawu.weebly.com/uploads/1/3/4/4/134441006/moxopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6006f9b47c3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603b3439e6212.pdfIn PDF document text
    • https://tazizepi.weebly.com/uploads/1/3/4/4/134439401/03d77a1664f8757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_606662421acd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_60622f7d403c2.pdfIn PDF document text
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/6085343.pdfIn PDF document text
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/wuwum.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/efba2190-13d0-44b2-8b11-d6430fcd600b/78331777115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa7f112-5d0a-4bb5-9483-d1e89109c026/38705872835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c005cd-3e56-44c3-8802-464868b0e417/codename_villanelle_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4dcf16-60cb-4abd-aee5-2d40837cab64/what_is_shatter_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7218e733-bc4d-478b-80bf-c2cb0a3b4b0d/98918816798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdb9451-80e0-48c7-a06c-e356a71f149c/9096748174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eaa5102-e66f-4ee8-ada4-faa2eb49b38f/labialization_phonological_process_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9bd6e9-81a8-42d9-9fdf-89c62561cf4c/52479384850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52abef8-bec4-4fb4-b2ef-2d84dfc5e524/need_for_speed_most_wanted_cheats_2005_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff456f2-c29a-4c3e-bfcd-c5206b2542ef/verukedid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5dbcbc-65ec-4789-839f-17e23836d8c8/64411160858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222c16c4-c7ad-4215-9b58-910b67c8c43d/how_to_astigmatism_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b066ba-7cbc-445f-b875-e6433529a203/kenmore_ultra_wash_quiet_guard_standard_parts.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5296 bytes
SHA-256: 28b011a901861165d1e11e38bea3ec59b67f046ef05085bf303be12053aeceef
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 10520 bytes
SHA-256: 455db9e31740ac30691d97aa72071ad4a097ac28a1ce3a32709a83e0881a11b2

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