Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fbd1032fa6c8bd…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 06:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67b40e7347e15290f001ac7c95d8479f SHA-1: 7c9bdc23fbb0862b254dd20df41baaa34cbafcd7 SHA-256: d8fbd1032fa6c8bd15b4771f4b42cc2fe784c3876582f1ee99e737f2c314d09d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. One prominent URL, 'https://crewmak.ru/uplcv?utm_term=download+mozilla+thunderbird+android+app', indicates a lure to download software, likely malicious. The PDF structure and embedded links strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=download+mozilla+thunderbird+android+app PDF link annotation
    • http://nadafashionbelt.com/Uploads/file/betodinesasegad.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/paronawizifawuvi.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vakutimaxotu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/29554490564.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/3643900614.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/cc1474190aabba0709cd7ce09eb49122/vamovaxe.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buwojivekema.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74384358959.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/doweguzutapujizanisa.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/45547012823.pdfIn PDF document text
    • http://innotack.com/userfiles/files/darulowu.pdfIn PDF document text
    • http://njchemland.com/upload/files/tuvejovazokamumopem.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/66959702b805c3f496c90cc9c6d7a9e7/32590839968.pdfIn PDF document text
    • https://penal-garazh.ru/files/77894769329.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/94711223678.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gabejijivudejimutovekenap.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/47680947213.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tetejosorebe.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fufukevevom.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/39746512712.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/rurep.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zowapojuwefuxape.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 17720 bytes
SHA-256: 03d97d2f412ea91b1df172dad9792bcb15492c4749ae76c187344f58b5abbbcd
font_02_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10876 bytes
SHA-256: 1fbae923d36148a08646efa9233c91c69c662e45743ceb5d3f5333225efbc768

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