Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eecd8ef4fd3436…

MALICIOUS

PDF

123.0 KB Created: 2021-04-10 11:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4414db4f1488c3014b1cde8f7020f86b SHA-1: b3036deb49eb183158765832166d59e4e2daba92 SHA-256: f4eecd8ef4fd3436901dee04e65fb4a9054bcf39da9cf5a09bbbc85cef9a5ac7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to search terms and document titles, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+the+summary+of+the+gospel+of+mark PDF link annotation
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/nadet-dolefa-wezesavavi-mopexuxisupob.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/8624599.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/agiCIgg/dark_theme_for_oneplus_7.pdfIn PDF document text
    • http://scarcebook.com/pugidetz7cqx.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/hfheoBs/77946460640.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/beats_solo_3_wireless_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/gyVV4SI/castle_story_puzzle_choice_apk_mod.pdfIn PDF document text
    • http://leopards.space/2235266499wiqn6.pdfIn PDF document text
    • http://zalavsky.ru/endothermic_exothermic_lab_answer_keyjja7p.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/wutubaziz.pdfIn PDF document text
    • http://steblin.pro/robepilodedekasa6v2sf.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/xutedirokeruxas.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/5648017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0fad380efcfc4eea9350ef51fb596f5a.pdf?index=trueIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/astragalus_armatus.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_7cadccaa48114695b252060b00ef49c0.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_10558627f5854d4caa1c81ce0401e526.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_97b5b13e93ed477cadfd1cacfdbe309d.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_156095b837744b439a757af15a666e15.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_9ffdda10172b4d759886362cc640b8ea.pdf?index=trueIn 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_off00019dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAC 5492 bytes
SHA-256: 7d82a853c8e5a24c87a3bedc8b172be53438e2090490f8c390cdb91b0951914c
font_01_sfnt_off0001b04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B04C 14764 bytes
SHA-256: 5d097251759692f100d6465c0f5b88bce0188e3aada9fabd0915d925344da71c