Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea76f336bccd6a3…

MALICIOUS

PDF

86.7 KB Created: 2021-03-23 13:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3df84238618db6cc8b182cfa7352e39 SHA-1: 82b39b4795bba4501dfee7f96cfa0147162c5f31 SHA-256: 3ea76f336bccd6a36c09471105a2268a46f393c266ecab120b6d6a6f5f836edd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=hill+rom+bed+alarm+troubleshoot PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/how_to_write_a_great_book_report.pdfIn PDF document text
    • http://selizixid.iblogger.org/73075883227.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/vhcjjAx/94167453917.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/oWjbjjW/16830006646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofojifasuxow.epizy.com/oster_hand_blender_reviews.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_005f926d325848b59577d05c4e05b2a0.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_816e2e6d0ab8438ab3fb18334e77da54.pdf?index=trueIn PDF document text
    • http://poxelisenaxoxig.epizy.com/36531933514.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_6230cec3ea764742b7a2ae491077f6a7.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_fe97fa9774cf433cb225c73e88674c16.pdf?index=trueIn PDF document text
    • http://depufidudonap.epizy.com/vatoxiganezud.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_fa96161fe7664c5b987ab6ff3faaa684.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/simple_and_compound_sentences_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/tasosowano.pdfIn PDF document text
    • http://kasaxamaburabuz.epizy.com/59907575008.pdfIn PDF document text
    • http://bevivose.rf.gd/cahier_des_charges_informatique.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/jetibu.pdfIn PDF document text
    • http://paguvodusijuwef.epizy.com/craftsman_125_psi_air_compressor_2_gallon.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/onan_6.5_rv_genset_service_manual.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/soundlogic_xt_sound_splash_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 5168 bytes
SHA-256: 5a5c17905fa13eacb6cbcc8a3c3f15673c64f7480f0a2b4638e341b237ff4d4c
font_01_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 11720 bytes
SHA-256: cded8f810b6c1f4f6bba0da2555040da606f441b47921f817455dfd677480da3

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