Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a6af12887d912…

MALICIOUS

PDF

86.0 KB Created: 2021-03-04 01:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec2b5e74c595bb4ece329701db2d7439 SHA-1: 46540368f3cd69dd0ddb0b5353fdcf206345c96f SHA-256: 825a6af12887d9120a96428e1083d8d85905ec4b82290ac81a382e5e98f09cd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://midufefew.ru/wix?keyword=partituras+disney+piano+gratis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5ff1e7b40122c.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/czHBqvJ/word_colour_picker_tool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5febe0c494422.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/4c62942ca41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_60093e3740400.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/gujeihN/magic_piano_beat_tiles_mod_apk.pdfIn PDF document text
    • https://subegawi.weebly.com/uploads/1/3/5/3/135394411/gupukepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5fee4d93f23b0.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/BHjjXeg/feudal_system_in_the_middle_ages_definition.pdfIn PDF document text
    • https://lotunesu.weebly.com/uploads/1/3/0/9/130969364/6322062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/aaiye_aapka_intezaar_tha_dj_song.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/black_currant_ice_cream_recipe_ice_cream_maker.pdfIn PDF document text
    • http://sasuwirakib.rf.gd/64230181309.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/nadovesobirodudipirirezi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16064 bytes
SHA-256: 6f8f67de02c0bf444de249837468894e421f58647d6654085e1355cc6b3fa3af
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 5280 bytes
SHA-256: 2e27fd142665d8c7a3d1ad6c85fad127e2ba7eadff665b87dbdb62833f6d9578
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 10044 bytes
SHA-256: 0c07b2f597f60219ba047254a0b27604b46eee69e58e5707f3a3f73b0e16cf16

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