Malicious PDF — malware analysis report

Static analysis result for SHA-256 043b6a07cc0a4104…

MALICIOUS

PDF

83.1 KB Created: 2021-05-13 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 235b700f0e544ab8111a53c55ed61769 SHA-1: d1e1111feda6a4a7bde009e93d3ecf4b5d272eda SHA-256: 043b6a07cc0a4104685341f68905a6cd5f299868d3d8af65f02fb99560a766fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=and+but+therefore+randy+olson
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/kexenejuji.pdf
    • http://takovod.66ghz.com/45365783512.pdf
    • http://carbackseat.site/stock_market_futures_marketwatch51bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4413697/normal_60388b8357b11.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/siborawut-sobulanake-gizomufasimawaf.pdf
    • http://gitutemove.iblogger.org/which_is_harder_navy_seal_or_green_beret.pdf
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/gabog.pdf
    • http://fastpeysistem.online/bixejakimimuwigoq538.pdf
    • http://alsamcctv.com/wupakovofonedajcoh7.pdf
    • http://shothard.site/vokodupobugodrnt4z.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_605ff128aac72.pdf
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/lezaretusuzero.pdf
    • http://zhenskiizhurnal.ru/dirageroyg2.pdf
    • https://kenafidoragakox.weebly.com/uploads/1/3/1/8/131856022/jolaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wusigipufuvowix/computer_organization_and_architecture_book.pdf
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_efc1db1e22f044dda8ca3246cb6a2899.pdf?index=true
    • https://s3.amazonaws.com/mejados/java_8_collections_api_changes.pdf
    • https://s3.amazonaws.com/divelatoxa/follett_destiny_circulation_reports.pdf
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_2e232d73bd634b9db5381f7fe56b4c90.pdf?index=true
    • https://s3.amazonaws.com/kobivimelelo/casio_exilim_ex-s100.pdf
    • https://s3.amazonaws.com/gumegulaxi/mufafunusafixul.pdf
    • http://lujolugajejizog.epizy.com/19547538204.pdf
    • http://bexalawisilinot.epizy.com/xizososorexugi.pdf
    • https://300a1258-3b13-45f7-80b9-bd8966f45320.filesusr.com/ugd/81888a_af43a71b5d6a4f62bf62f7b167138e8f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ac.bin
e6d02eb93ecfd06affc36fa2aec40c80a75f385560a81237d9cc7c574377c374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 5224 bytes
font_01_sfnt_off0001196e.bin
8b99cd3bd97d5c81d8026b1f7319618af29c0b157786119a285a906d35935638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 11012 bytes

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