Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b79c279ae525979…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 12:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9cef81c4b40f9ca09811e8bd11e824fb SHA-1: 152ab29e7435b6f0a804487821ebdfd06c9f4e2a SHA-256: 4b79c279ae525979d5ded7563769bf54995c4ad44a4e5e60aedd8d058723f50f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=good+android+rpg PDF link annotation
    • https://micro-logic.ro/images/uploaded/file/xuzegemuduwinutarosel.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/43868759668.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/91592611919.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/bajawi.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090116332862.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/16925286201.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lojizape.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090116082229.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gejuvexax.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/fajosawevusoxame.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tagod.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/49496326893.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zegoxejoxezi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/44801209917.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/68349385044.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/90153470485.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/gajigigofadazipusiw.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pigoguxamewotefigabafox.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/buzolojiposiwesu.pdfIn PDF document text
    • https://akconta.com/uploads/files/nugififofuxozuwasixip.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ruxupozuki.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/78762759865.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/nulakamiretigan.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_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 17708 bytes
SHA-256: 29d4e4be30a40304b4f19dd1cdca5e0426e1a3ea55057f3dd18b45b9806a84f5
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10160 bytes
SHA-256: 71067ca72f253122a247225909f56c42150e00e860e113fc34716456afe7d33e
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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