Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f256333b252626…

MALICIOUS

PDF

69.8 KB Created: 2021-02-19 14:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 97854baa66dab1c116020f78b33eac79 SHA-1: 480f0deb8db064a3625597a583cbc7ca0bccc66d SHA-256: b4f256333b252626924f4a8226735f313b6e3a3f62d3cc99534d644839e25206
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute further malicious content or phish for information. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification suggest it's designed to exploit users, likely through a phishing or malware download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=ugly%2527s+electrical+reference+2011+pdf+download PDF link annotation
    • https://livozowenenebu.weebly.com/uploads/1/3/0/8/130874097/638376.pdfIn PDF document text
    • http://mjawebdesign.net/master_tung_acupuncture1lmux.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/6154074a420.pdfIn PDF document text
    • http://immorta-cross1.club/raripoxez8zerv.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/b250cc3478a54c8.pdfIn PDF document text
    • http://zejizeb.22web.org/boxhead_zombie_wars.pdfIn PDF document text
    • http://zewojapu.22web.org/3392132322.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/sazupejoxe_tumuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60120a9857969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufofot.rf.gd/83561958474.pdfIn PDF document text
    • http://nikonujilo.epizy.com/rain_dial_sprinkler_timer_manual.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/performance_appraisal_template_word_uk.pdfIn PDF document text
    • http://mulazukaga.rf.gd/fanuc_18i_operator_manual.pdfIn PDF document text
    • http://tufopabapud.rf.gd/busumeve.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/compression_test_lab_report_conclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/streamline_english_book.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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 5868 bytes
SHA-256: 8cd45b53184339cfe70635f3bc163d0892b85fc112d4c4a9f24dc8d2506e2350
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 11128 bytes
SHA-256: 8ef892dcb824d53156caa3eee1cce70a461dd7ce78c8c63f4aeeb55a6e93c8ca

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