Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8f820676fb8b3a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 05:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a7860c88998f01b2a36f09622239a86 SHA-1: e01fc09adc0495c922f30966b330b17eb014180f SHA-256: 1f8f820676fb8b3a99970d8f87981907ce512c55cef35035adc7252d98dc6ae7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=how+to+get+messenger+off+my+phone PDF link annotation
    • http://packturf.fr/files/9451470613.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/vuzujijebijutikolunuk.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/takidu.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/72113808787.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/54925928707.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109012349468727.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/22702958450.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/80559565141.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/40670741859.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/28567817751.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/japebusifoniratevep.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirevegemojokufo.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/54773076749.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971533126807.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/jumediteforokuxiwilaka.pdfIn PDF document text
    • https://datawire.gr/files/files/jesimitonalapelijibabavuf.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/32002305300.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/daputizidej.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/68319977219.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/gowususi.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/vajoxira.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/86832671423.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/zibinudalejotutena.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_off0000b66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66C 16828 bytes
SHA-256: ac29dfdba4b69a6076704324d912e771fd9e0d05ca58f0d3c83d28337b65ae47
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10696 bytes
SHA-256: dc41e5efa13996e7d3814f2f18a28ecab10264469b524b8c7c07b36b99c700c0

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