Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad64c9ba193e470b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 07:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d83a471981bcd2e9c0b7dfd015b7fc2 SHA-1: f95ddd7c64b12380e69623fec7242219c0525720 SHA-256: ad64c9ba193e470b77cc5addaf9bfa97c34402db75e0ca93b1701051a042cce0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or redirect to a phishing site. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://levakov132.ru/userfiles/file/punuzepogirirolaran.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/fenav.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/65570097054.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/fipejobexinemugepibotom.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/woweror.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/telesapepogiwibafumukodan.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/wetiremurod.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/22535212147.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/47164789414.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/ziniwaxubewus.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/82228023437.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/gemurelivagifelakomope.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/99721527096.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210908232308.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/nupunelaxipepobo.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/39282689061.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/lozobonisujozoxemututa.pdfIn PDF document text
    • https://kimcert.org/E/file/buvoxamusozunudu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305de995291---gexugelex.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fotimiro.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/pokotamonepewoj.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/lugun.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/tedazewumekogigojorajo.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/varetimib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=angry+birds+2+apkPDF link annotation
    • 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_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 17244 bytes
SHA-256: e828bde8a9ca6544af761e858dcd83a9adfc7f017e47ed9a45680b6f011454e0
font_01_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 10616 bytes
SHA-256: 04c75c4bb9b17782a8e1336b333101e8ced8b32a9e30d2e34690e503bf13917f
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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