Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2eb0cb07e41882…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 00:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9f92d8b0d4d27ced98d23c601ccb204 SHA-1: b96d8f69982ebd47b0d14d3006d999fd2282ca39 SHA-256: bf2eb0cb07e41882e26064a259eaf9514d3ed7fc0b0f4a7af30bf8c7e4ef36f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external URIs indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=gta+5+game+data+download+for+android PDF link annotation
    • http://lsphc.com/userfiles/file///wezitodaredo.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/nanevikuxuwukapi.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/4818717259.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210913_1138EC44EDF6D63C.pdfIn PDF document text
    • https://cicimanis.com/contents/files/vuniz.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zafaf.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/rovifimidu.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/12040952903.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615119e59bf98---mivipofozubavopofe.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914092238.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/sabojujowizutikegivafof.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pesagesobutifuvefov.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901120951_6jrb0u.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/kamuvixasanoforudesosu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed8a45039---55866788042.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210921_AB092B1782918A20.pdfIn PDF document text
    • http://aven.su/userfiles/file/24386129050.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/12103432175.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/domusog.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/66790225988.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/4658490523.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/57141048836.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jaxixodiwijuler.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/1233024036.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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 10788 bytes
SHA-256: 998dc53276316ea7306f5b3c136b997a10fdf470275356a3c0c31e6809885a02
font_01_sfnt_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 18068 bytes
SHA-256: ae9703fde7b80cb10d6c868955c2502dde4403229cf1f84c0424f6f9257eef90
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1