Malicious PDF — malware analysis report

Static analysis result for SHA-256 b422d9b1e3f06c2e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 12:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38df20c77a5af20fcc4f4b39505712f6 SHA-1: 637fb05ac9f92949f9404330ea6d885616d5ad98 SHA-256: b422d9b1e3f06c2e7ab02cae2eba36dc0ab351d58bf05ad752036c9fca1cf5d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms for PDF files, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=best+hd+sports+streaming+sites
    • https://lifecareproduct.in/ckfinder/userfiles/files/99598356472.pdf
    • http://status.cz/UserFiles/File/tupidaduso.pdf
    • http://alrabbancapital.com/file/files/18551257101.pdf
    • https://sharedsynergy.com/userfiles/file/vasasususok.pdf
    • http://geometrabottero.it/userfiles/files/41313721408.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe0dd9b52---bijuvakuvepeg.pdf
    • https://orcasproje.com/userfiles/file/zuzomegetumop.pdf
    • http://tw-jia.com/uploads/files/202109070226157067.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/338b5cb9496249b09f43c17cc3ce1ed7/83977542194.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/putovijuwufirexewadefisif.pdf
    • http://dfanchem.com/upload/files/12139576140.pdf
    • http://chinawin-consult.com/userfiles/69313604264.pdf
    • http://imdad-egypt.com/userfiles/file/80166853989.pdf
    • http://labsshop.com/d/files/kafitaparexo.pdf
    • http://studiobonvino.com/userfiles/files/tegibakokubud.pdf
    • http://www.donboscovizag.org/images/files/kilejejosiruxojivep.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/nivovatigiwizes.pdf
    • http://hzqljsj.com/images/upload/File/galojapegomizeromob.pdf
    • http://duonglaohanoi.com/userfiles/file/kudomiradopunuwo.pdf
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdf
    • https://vivekanandbawwa.com/userfiles/file/nugofapijevubogapi.pdf
    • http://unstitchedfootwear.net/files/file/75587813121.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/vanoboveweluxudobimejipa.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/49658645862.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin
ddc21f9cf92ca7faf253ee294fc1fb7788eeb33a0a50b88eebf07d115b2fbb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 17804 bytes
font_01_sfnt_off00010829.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 16792 bytes
font_02_sfnt_off00012040.bin
16a6377ea62574f3cd3e78160b261e6dc83e8fe045e402786f3f50ae88b211f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10848 bytes

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