Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3c37043b97c34c…

MALICIOUS

PDF

76.9 KB Created: 2021-02-23 23:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ea551c07db9a496dea01cd2509333071 SHA-1: f511858bddff748212fc358f4a085e62db1a6cd5 SHA-256: cf3c37043b97c34c9ae142cff155e8de1733df6c3f4bb4789601e5cd2fa80c9a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of many external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=how+to+use+effects+send+on+mixer PDF link annotation
    • http://faceit.su/new_york_city_bus_tours_reviewsha6qb.pdfIn PDF document text
    • https://dulodegusatoto.weebly.com/uploads/1/3/1/6/131636763/5b099f3015.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/veriwikabamaloputawi.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/635073470707ki3u.pdfIn PDF document text
    • http://4escam-bot.online/free_template_christmas_invitationskgcty.pdfIn PDF document text
    • https://cdn.sqhk.co/daviluzabidi/hbjcggU/amazon_home_services_trampoline_assembly.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/52871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_60187134bb35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_601044229b830.pdfIn PDF document text
    • http://1xbet-regi.site/compendio_apologetica_catolica3h8ps.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/ijIP0ez/69836399496.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/OjbjfWP/uncertainty_calculator_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/bJR2EiU/29031317823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457281/normal_5feb84ad35a91.pdfIn PDF document text
    • http://esagafow.fun/sound_effects_warwick_ri7dh1c.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/b97cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/cjKsCuH/jedutenadopowemowutewez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5048 bytes
SHA-256: d2b92b1f17dd005485e5b344a47935d6813aaf15fa2287860ac2119ad0058977
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10748 bytes
SHA-256: 28b090c29da98f5b784864fcfe63e51ce75b256949040727c692dd60d037708b

Open this report in the interactive analyzer, or submit your own file for analysis.