Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d03fe6502f5e9d5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 23:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb3f23a804254f40bb5c9dfe758c3187 SHA-1: 175cec9fb68b70792f79c5c96c961cc61c674e76 SHA-256: 2d03fe6502f5e9d51ccb65f3f8e6fb373cce696edbf930e4bb66226a6f5d8a91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites. The presence of PDF-specific heuristics and the ML detection strongly support its classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=iamo+bazaar+app+download+apk PDF link annotation
    • https://sunnyvale.com/wysiwygfiles/file/18856920817.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/53565074522.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mibapedebinexufa.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/witoxosupuvome.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/xaxabudimo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/10073036863.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011836257500.pdfIn PDF document text
    • http://newshop.jp/archive/file/kewugononenozidaxex.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1b189d76abc3cb7115a4e5ef959cf03b/zozevepuvanilozuposejabej.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/19009864433.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/99695419408.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/dumuxezasusanofo.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/tatovuponi.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/kiverizagelar.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/fanuzeraxupomofajipowos.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210905_135042.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/27632669470.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/25515167759.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161393f05960d4---67693761891.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/romawikalotedux.pdfIn PDF document text
    • http://hbaoge.com/upload/files/silakatigovivibimamugux.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904025324895385.pdfIn PDF document text
    • http://saint-party.com/media/file/5813948451.pdfIn PDF document text
    • http://cssh.es/img/file/viguzazabonegabodu.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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10392 bytes
SHA-256: f7ec41d11a9677852d460f8e59edd66dfb101bf1ce97bef4c57eff1c0dddbff9
font_01_sfnt_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 16616 bytes
SHA-256: a6120134ff5d89180e17f2ea4532dc54191c276808ccb8507ef28933d4bf28c5