Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d5d37da301c065…

MALICIOUS

PDF

90.2 KB Created: 2021-05-04 00:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 15412f4f87ac56f78220861bb643e047 SHA-1: b99eb70a7df3b691b11fcc2916381b9e27792f99 SHA-256: a4d5d37da301c06547e447015dffdbe2556adc3afdc75bedabe4f2ebdd8fa882
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, with one specifically pointing to a URL that appears to be a lure for downloading content, disguised as a search result. The presence of multiple links on disposable hosting further supports a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=2012+end+of+the+world+hindi+dubbed+full+movie+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456676/normal_602315172c0df.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/anticorpos_monoclonais.pdfIn PDF document text
    • http://good-production20.site/vorubuxosumofipuwofqslgy.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/pekuzekamegorosizumej.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/konefamaribusapotevidozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_605363bd31fc5.pdfIn PDF document text
    • http://ig-mediateam.net/asp.net_mvc_microsoft7fu6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_333452f7a84540ca81f7e5bf31add208.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tektronix_465_oscilloscope_operators_manual.pdfIn PDF document text
    • http://sukowinom.rf.gd/vabex.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/potugevilipoke.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_ab01270464b94e9fa7fa8d2bed6db9cd.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_f9dd43b575cc4e6fb5c0b5827a577b95.pdf?index=trueIn PDF document text
    • http://vexujiwupif.epizy.com/avanzabus_malaga.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/company_profile_design_ppt_free.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_68bd92a200c942e48fbb42d576647227.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/12212269343.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 5492 bytes
SHA-256: 19d8e5b309db12fed82cc5ca29040d671e8e7818d3dd7c37f836dca5d4d0ed5e
font_01_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 12212 bytes
SHA-256: 7e3cb7ac00e064143b1790671e5256396c2ac16b46ab04c922c2fcd06b1d0cd7
font_02_sfnt_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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