Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3942750193b40a6…

MALICIOUS

PDF

71.7 KB Created: 2021-03-21 23:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c130890768cdefb6dfa29688ad3ce0d6 SHA-1: 38eee0afc2e38e28a3c577f8e5ec16a5cd0743b7 SHA-256: e3942750193b40a67a705868e568c8986d8374e900c1dd143fe24e361f389198
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external URLs, with 'druttle.ru' and 'zakofuta.66ghz.com' being prominent examples of link farms on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

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://druttle.ru/wix?keyword=cell+transport+graphic+organizer+answer+key+pdf PDF link annotation
    • http://zakofuta.66ghz.com/powerpoint_templates_free_education_theme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5fd71854da08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6054f2750acff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_600556596059c.pdfIn PDF document text
    • http://wovewor.iblogger.org/the_alienist_season_2_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fd3c2d4b2bae.pdfIn PDF document text
    • http://businessmentality.com/tebesexddrpx.pdfIn PDF document text
    • http://ital-tess.space/219582931496k8o9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_60302f0e8957b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_c8b78b2ff573439ebe90fd3679567c86.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_7c30400d0ff4456e8dc4e39991b4b8b4.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_9117b5609bbf45d09aaa0885a33ebd51.pdf?index=trueIn PDF document text
    • http://sodojok.rf.gd/amc_10_probability_problems.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b03f780f84674874ab7e7ed4dcf51ae2.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_31c2de6ada584f56bbf1858630a63280.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_aaa9c8b1cad34ae698b30a14fddca8d9.pdf?index=trueIn PDF document text
    • http://jizonizop.rf.gd/bilisunuxukijejifasigapa.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_05c995872ad9402c97cce77b1df9b639.pdf?index=trueIn PDF document text
    • http://vosafaw.rf.gd/email_verifier_tool_free.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 5628 bytes
SHA-256: 7cda02afc9b17e9ae5cfcf4c52e52e89ac5579167acbc54487aa87f6bbaea4c4
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 10392 bytes
SHA-256: 0b96aa168da9089a5161b151caa94c6bfff8965a5868b6f92d5fd3107dc2a22e

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