Malicious PDF — malware analysis report

Static analysis result for SHA-256 053c1dd53c5c542e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 04:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ed52f143dad36cbdd898964c586dc026 SHA-1: cf1b90f9f04cdf86279f4fdaa16dc27575da7f9a SHA-256: 053c1dd53c5c542e844c4e1e24e8b412b45c93716dfb12b290fc9f8e0c2aeccb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=oxford+philosophy+dictionary+pdf PDF link annotation
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • http://calisnt.com/uploads/files/86030265706.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garejumet.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://vladjurnalist.ru/archive/file/sotisamujoj.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/wituwomonedofi.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kevobevokuxujurudiwazad.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/girumobuvekuke.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gefafafeledijejavitujef.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/wavumolibomelopevopapu.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/34777852866.pdfIn PDF document text
    • http://beruanglucu.com/contents/files/82942209627.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sitirakudikozoxadumini.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/leposemukiwaba.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/2146979475.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/46597418020.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa41b5d6f---12651315439.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906042938_327400010.pdfIn PDF document text
    • https://vpmemorial.net/images/file/podivodigolugoduvokad.pdfIn PDF document text
    • http://weldingplaza.com/files/file/28705440326.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/484864978.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/botufibabidabugobupuli.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 19308 bytes
SHA-256: 2bc5564e8336d5004d37b465f01180b7b632140ebb35185cf51575030385451a
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10828 bytes
SHA-256: d53872d682e2c2cb2cc53b2daabdbe5ddc83a820333ab31bfc557dc8ef0f4f21
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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