Malicious PDF — malware analysis report

Static analysis result for SHA-256 07892b69cd42ffa0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 10:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f935be99ec4cb2031f576c7c0135d9e5 SHA-1: 64e4f1bd6fd21360f15ea5cbebe30249bb7b12bc SHA-256: 07892b69cd42ffa002dbd5545d347f114c6cf896248a0a676153b63b4d689a1d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n2ipohfhv1pbn2iu8er0io4hia/60759200284.pdf
    • http://xprchemical.com/upload/files/zuvawebutevipomago.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/supawunaside.pdf
    • http://energo-market.ru/sadm_files/tavewodi.pdf
    • https://badrivishal.com/media/letetezuvifudul.pdf
    • https://ecoolteh.eu/galeria/file/wibifuloxusotoliwu.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/detojulabitunajaje.pdf
    • http://zamaro.cz/images/fcke_files/file/3346291611.pdf
    • http://peoplefoster.com/pliki/tatonijipapegedakelupu.pdf
    • https://cian.hr/userfiles/file/kobapimen.pdf
    • https://millvalley.com/wysiwygfiles/file/56048390274.pdf
    • https://subded.org/userfiles/file/7627156675.pdf
    • http://karat-dobremiasto.pl/userfiles/file/zudezelikebatozaxub.pdf
    • https://wrd13.com/force/file/zixab.pdf
    • http://dissanna.com/temp/fckeditor/file/42678760497.pdf
    • http://matrix-corporation.com/upfiles/editor/files/lejago.pdf
    • http://bona-agra.pl/Upload/file/fagof.pdf
    • http://chinahongji.com/d/files/54595668716.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/27247240339.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405471bc8d6---tuxadelivebutefivoluv.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/59215688961.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/2166545134.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=php+to+android+app
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e4.bin
c61189ec88475c772389d0c4a34ef53d0f52c1309d6f191c8dd1c40554ae9c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10144 bytes
font_01_sfnt_off0000f968.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
font_02_sfnt_off0001117a.bin
9e49187c75612da2ab72f02c90a7b9907c66f0ff96e6983c0f31780fe11c1b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 18272 bytes

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