Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b004831e408fb3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 04:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 976e2e0805e10c841734813d3329fcea SHA-1: 1d2c301bb690f60f2cf68f2a1026102d3851ccff SHA-256: a9b004831e408fb31059944ad00ffe07c7ac2c7892f732ac271335d360d77a91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely phishing or malware distribution scheme. The PDF structure and numerous links suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thegioibaobicarton.com/Images_upload/files/xaxawaxedisiviligodumod.pdf In PDF document text
    • http://rigdrilling.org/userfiles/file/makikatidalikozawikome.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/90681535768.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/17239773121.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdfIn PDF document text
    • http://erictex.com/ufiles/files/lofaposemidekiwojokavorit.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/54802753934.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/28405930398.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/12856443154.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdfIn PDF document text
    • http://gazetavk.ru/img/file/xumejuwabufinekuxu.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/16159564283.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/68173453190.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161329a3450f92---35150893592.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/19017771238.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210904204903_584f36.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210906064727141.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/lixajasaduduxetikugiwudi.pdfIn PDF document text
    • http://asustainable.com/global/file/94248133875.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/tufevineworawe.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/napidoralasorikexirilamo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/13995480595.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/86904539998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=periodic+trends+of+atomic+sizePDF link annotation
    • 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://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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16852 bytes
SHA-256: a25de7fd6abffd8823a7cd27aa557b82581422c44f3a86fe1a2871f4761a276c
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 10652 bytes
SHA-256: e5c6134f9901fb24095b9f17d77e108ff8938aa392473ebc9a2fef4eae6ffc57

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