Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ad3fa55f4993b4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 03:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d786a4235e22c003cfaf559e5bc7c86 SHA-1: 6a91d05a0fa25de7bd41262b51f22a6059965668 SHA-256: c4ad3fa55f4993b4bca6b3a2bd79be0e7ddf2dda396e0b64923f27eed7ca4783
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, characteristic of phishing or malware distribution campaigns.

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 https://alusol-kw.com/ckfinder/userfiles/files/47441578285.pdf In PDF document text
    • https://fokusmedia.com/images/uploads/ziwejazoxifinutubol.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/gezejutofi.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/venokasirowenolajetis.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/34401908652.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393f70db066---japufepepe.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/2104175836.pdfIn PDF document text
    • http://come2menorca.com/images/file/16414364900.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jesawufawuniloxixuvame.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/51106964680.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/91266971058.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/8037395123.pdfIn PDF document text
    • http://splogservice.ru/content/file/fodiladubuwig.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109071700408093.pdfIn PDF document text
    • http://mylodge-naoshima.com/jamobobutobuxedokalugemoj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/58981918025.pdfIn PDF document text
    • http://unsersohn.ch/images/file/48909134534.pdfIn PDF document text
    • https://autoskola-scp.com/files/84562724642.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/notasasabigukuketigunito.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/20383571776.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/49613395020.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/74384696206.pdfIn PDF document text
    • https://kristinanamaste.eu/files/juxururabipujituvu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/pawuropakudotupavemobexod.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1df377b95508fafba2575a402ab90768/13781437354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=redmi+k40+gaming+price+in+chinaPDF 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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10864 bytes
SHA-256: 4ce47f37eb8e595f7002edeb33a634c2efdaa71cd0d70cfc444cf6b4833f7606
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 19396 bytes
SHA-256: 8490e9e41102629fda3e1b21018aa198185626937903475ecf3dc4d5fc7d239a

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