Malicious PDF — malware analysis report

Static analysis result for SHA-256 4552c43c0a0a0d4b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 15:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b2244e3a3d6f72425bed37e68559ccdb SHA-1: 53bdb59db8838b2d08e02070410ce71748483b11 SHA-256: 4552c43c0a0a0d4b8300e362cc55ee7560b8d4116a2ced7512880027a7bcb26f
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 0.9996

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://druttle.ru/wix?keyword=dog+care+merit+badge+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/vemegunir/gAierib/sugar_free_vegan_cake_recipes_uk.pdfIn PDF document text
    • http://ourfutures.space/adobe_after_effects_cs6_free_intro_templatescw6m1.pdfIn PDF document text
    • http://sdfafq.info/project_management_skills_competency_matrixyf4w7.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/29750342304.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/weter.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/gibgfeC/nuvevupazapiraxi.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/g1ibkge/mediamonkey_skins_deviantart.pdfIn PDF document text
    • http://consequences.space/6024343402488xgg.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/Au6IAhc/66594820909.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/gAihM6A/remidezuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruludamena.epizy.com/airtel_app_uptodown.pdfIn PDF document text
    • http://punolubumima.epizy.com/asphalt_8_hack_tool_apk_without_survey.pdfIn PDF document text
    • http://gonafumereber.epizy.com/digital_media_agency_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/beatmania_iidx_bms.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/68903014915.pdfIn PDF document text
    • http://jilerixam.epizy.com/nes_emulator_for_psp_3000.pdfIn PDF document text
    • http://bubopewufifinov.epizy.com/89009467316.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/85795810580.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/graphisoft_archicad_22_studentenversion.pdfIn PDF document text
    • http://motatowavem.epizy.com/roruwegotemoreruxekadib.pdfIn PDF document text
    • http://zotawof.rf.gd/gedser_odde_guide.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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5616 bytes
SHA-256: a8ab64943115675b99c38a02fc8afdd9f0b560cbd339a21a0678d80f07dbe98e
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 9972 bytes
SHA-256: c605c5f50c5c1b5818cae8710d71e9a7e21a89fde71c056d7f0f1c0ba98a02bb

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