Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e78b3f5dbf8763…

MALICIOUS

PDF

67.5 KB Created: 2021-02-18 14:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: db6c755599d2ced5562cec3f57b90ea9 SHA-1: 64b0141cc3c35bcdacc8c7318824cf2fa3d2fc05 SHA-256: 62e78b3f5dbf87638cc3448de0e76417584578a2000de94d10f6820c4a829bd7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=angi%2527s+camp+skyrim+map PDF link annotation
    • https://fanuxerejupu.weebly.com/uploads/1/3/1/3/131398214/4301591.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/dgejghg/banco_bradesco_stock_dividend.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/divakofododipev_kuregafekig.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxodinumoro/jdpibyI/filanosomesalez.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ahaD0hc/wwe_2k20_universe_mode_draft.pdfIn PDF document text
    • https://cdn.sqhk.co/bidufewo/5ShfCii/velutuwema.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/siligebugu-mikodexopaga-pavudoku.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/vamezilonikibak-lijamotoxuk-xarunuwanuva.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/1910987.pdfIn PDF document text
    • http://izzzaaa.space/strategic_management_human_resources_definitionta964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leributafa/amazon_music_failed_error_223.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/eternal_palace_mythic_raid_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/file_oracle_blob_java.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 5412 bytes
SHA-256: c9f36ebfbd3eb7ff69268f5b8a773bfe7cfd76a39160d1ce4bcd72ab441d09d5
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10244 bytes
SHA-256: 6e823f818dea9a95ca7f6f2c28c5213d0298dd95c497311c574baa9f445830f0