Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf61e6c93ae616d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 05:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72bf9fd6a0d8f8a02fdff87c2be49828 SHA-1: 0a61d57dc9daa992317b2f190c500e027e25997e SHA-256: fbf61e6c93ae616d47cbcaf4aea6e0a27e641294cdf3b07d6236c935c470be47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=android+atari+oyunlar%C4%B1+indir PDF link annotation
    • http://uptownherndon.com/uploads/files/25458692940.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wisirebukom.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pitepoluwusetujofijalorus.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/dajakanubogezoxafew.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210904_14C7E62444C6393C.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/18792092762.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/11998697850.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/munebeduwolenorexo.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/20137035155.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bifimulakuboguba.pdfIn PDF document text
    • http://toroisg.com/public/images/files/zuzulefukemujiku.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/94821513982.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/2240892505.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52050494673.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/98132244567.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vipusenu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sizufupa.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/rolafurofikakovumug.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/4726989732.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_E6252B5B348015B1.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 18796 bytes
SHA-256: ceb5a9a8cde7973ad6aaf6c4775615255ecda7bc6427fba4449f976ea8c3836b
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 10184 bytes
SHA-256: 51b5e619650eff2c88681afc7c346267a3d94d51b7a6fe7498885b1adeaf471d
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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