Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c148b85f3ff350…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b14efeff6d14d1523bd77f6c4cf664dd SHA-1: c7e5fe0fcbc74a0162b4a7eda662bf9437c44250 SHA-256: 50c148b85f3ff350093c130ae7b83feb3bde737ed056aff3c163895c41f574c5
194 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The primary attack pattern involves a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=jensen+vx7020+update+navigation PDF link annotation
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/koxifineja_kirav_rotirowa_wevisefasovit.pdfIn PDF document text
    • https://wekimede.weebly.com/uploads/1/3/4/8/134862148/7105380.pdfIn PDF document text
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/1966899.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/felofedopuzagajog.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/physics_gre_solutions.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/monunamasik.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/jhiSje7/20914891747.pdfIn PDF document text
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/2b6c652a52.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/zebaf_gagojesimij.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/wakukobo.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/kiaijhg/vufadamisolevepinunebise.pdfIn PDF document text
    • https://cdn.sqhk.co/roxigeve/jgje8FY/the_world_ends_with_you_switch_price_eshop.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/Agcgfhe/areeka_haq_information.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/42BXRgh/example_briefing_notes_template.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/xezogok.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/ijeoJ1G/samurai_2002_mp3.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/89338131494.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/fmiggiF/early_worm_catches_the_worm.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/idicjaE/fear_the_walking_dead_zombie_origin.pdfIn PDF document text
    • https://merusedezut.weebly.com/uploads/1/3/4/3/134361649/porutokib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwuvapinemugi.rf.gd/8432749183.pdfIn PDF document text
    • http://dapunujunet.epizy.com/how_to_stop_your_dyson_smelling.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5472 bytes
SHA-256: e2232d06e69a221b27a60a45d0587bd60eaf91fe0224416c8973a4807d451f0f
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10224 bytes
SHA-256: a92c875d7e5e95af1e01a05a989ac10b3d52b16687e523fd8f8e22da59396ff5