Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d05568e74ba99a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 22:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f37aafc54bc5ba3e26ba07011e29d40f SHA-1: 4987647cb3abda249e8f41b69a85137b95570a6d SHA-256: 56d05568e74ba99a5133dcf72b7b2a066bde7d01dfd27349f77a2f1089706660
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the document is designed to host many links on disposable domains, likely to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://drafthe.ru/uplcv?utm_term=push+pull+strategy+definition PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1fd5031f0cbdc6708c6f29e4998f38d8/simopozewejowudogodeneve.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/fozinepizobukasujenizama.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/93866813216.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/77744462061.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33340378789.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/54341883691.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/tapatarorivapodogadot.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/dotumaguf.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/muwupujikuxi.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/67132444900.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/8709964899.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/zunijoku.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/gomow.pdfIn PDF document text
    • https://alpinashop.bg/files/12794653474.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/43115514731.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/vodugu.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/rurowutagoka.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109091720146474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4b162db2---59001992273.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zexosojupuwax.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sisuzapesasidik.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/mubipivefudatuxewolosox.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/fugetaporenofulutit.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/dubelivusijadatasuj.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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16676 bytes
SHA-256: 639a64eae419a67e8bb57faa92da4bdb5ac665b33c5968610d809357668024be
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 10992 bytes
SHA-256: f79e8786a2ef78107e62da1b1c1d254fddbdda47a0da9b6065c2a04b73266f2e

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