Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad9a1b6e57f7fd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 14:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e469bf519c37af02ae077546afde128 SHA-1: 32d9c6af3776ada7439a7afa10e3ee92aaa88b7e SHA-256: 58ad9a1b6e57f7fd159b5fc9056866313df21661c36956ce75714a4d505c5c48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

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://coretry.ru/uplcv?utm_term=google+maps+stopped+working+on+android PDF link annotation
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/80749364108.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090111102140613.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/wuwolalekomeguwetenif.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/78564937559.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/vemupimuxifimaxalogobeg.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/baserokorenet.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/494567094.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/nepikopurubedivabigixiba.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcca75c29c---47875703645.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/6805928732.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nebutuxirakuwezo.pdfIn PDF document text
    • http://hejia-ele.net/upload/nibusej.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-10/1bfd0eda07a9558d0ccbe66e921b316d.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xosigidu.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/19739136655.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/disoxobiruged.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/toxuxiwaxidimosesuwimafok.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/36906321095.pdfIn PDF document text
    • https://gilbertems.com/videos/file/vujikefabuvopazefalosidis.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/27250487215.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/20274473737.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://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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10952 bytes
SHA-256: fa1c1e990b506606821db90deb3bf5fea9b4660e7f6af640aa1ed920b3119449
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 18780 bytes
SHA-256: 68690250c350146120fab5e45c5e08b96397ee896746e00d6de7b1c4605b0a9e
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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