Malicious PDF — malware analysis report

Static analysis result for SHA-256 1129f87b0dbcd1bc…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e4c80778051d482f7abf8f8a12c9ece3 SHA-1: 3a5203444dc75b30f7fb860dc79c79919178a3fc SHA-256: 1129f87b0dbcd1bc54dccf299d9e33ca6fc089b6a46bd6b7c6c0affbc3028365
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=best+emoji+keyboard+2020 PDF link annotation
    • https://jphotographyllc.com/userfiles/file/46001334159.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377114055b3---zulugamizigidel.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/47190955914.pdfIn PDF document text
    • http://sentralperdana.com/file/dufusogibat.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/gizubapigowotisekipov.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219393026.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/zofoz.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/leziwigibogixa.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/20881629059.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/34499625892.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/motonelo.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/5959582171.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/19760038852.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/75265211847.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/84551526879.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64300036179.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/suselufuvubegugo.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35130893110.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901072845.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/kudimum.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319d631c29c---71784998920.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630452939957974870.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/jenajesewifa.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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 11032 bytes
SHA-256: 9706670d3a58027aa4ca9245d0c83fef6fd26b0dae6e4c796a35db81ff747804
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 18084 bytes
SHA-256: b4ec8ffd5a24e1ead9701879759598b05384cfa32c9aed30984e094cc7129066

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