Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb51357e12b0f42…

MALICIOUS

PDF

78.9 KB Created: 2021-02-17 04:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3a2bf5dcbcd09e1349d9436f0b0c8646 SHA-1: 0ea956ce45dcf75ef4d24dcec5640b989a1eef6f SHA-256: adb51357e12b0f4295b9e72678bc02585bc1409959cd5547956bfb02a115d4c1
184 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 links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to studying resistor color codes, which may serve as a 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+study+resistor+color+code In PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/0d409a0d3ff98b1.pdfIn PDF document text
    • http://sowurokirifi.22web.org/47591130854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_5fd7c1ad2824e.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/bfc76.pdfIn PDF document text
    • https://pakajifovajopif.weebly.com/uploads/1/3/1/6/131607230/da1840c.pdfIn PDF document text
    • http://ontrade.top/dead_man_walking_theme_songnehgs.pdfIn PDF document text
    • http://jakartapro.xyz/vagenumumazerofatekuxqhvq7.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/dologetipotir_vepebenafez_zorivud_wosogomilojodu.pdfIn PDF document text
    • http://onesmall.space/weider_ultimate_body_works_videon9frs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5ffbd98444a98.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/dovonamagalosubizawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6020d03f47b0c.pdfIn PDF document text
    • http://eroganoficial.site/narogidunhb7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5fee7d7d99ea6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidivatepijalaw.epizy.com/5400739355.pdfIn PDF document text
    • http://xaxibalese.epizy.com/codycross_answers_group_181_puzzle_4.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/deviant_spectre_osrs_guide.pdfIn PDF document text
    • http://bokonejedebi.rf.gd/colorado_rockies_players_weekend_uniforms.pdfIn PDF document text
    • http://dibadedogiw.epizy.com/west_of_loathing_parents_guide.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 4876 bytes
SHA-256: c7522ea8db55194c0edf89480e33c36801477ccf034cb547b8cc8258e0d043ff
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 13288 bytes
SHA-256: ccfac8a3e60180f9872afaae71ef50f3c05755919acaf408c4d2019ec9eca324

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