Malicious PDF — malware analysis report

Static analysis result for SHA-256 b364d1c101e4bf43…

MALICIOUS

PDF

72.1 KB Created: 2021-03-19 23:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dfa0621d21e8bfa2b2f7472237eb351f SHA-1: 4391949791f6c45ee04edcfa2f40c07a5f6ad8ee SHA-256: b364d1c101e4bf43e847fc6daa184a5458b3ce6665a17845581b0766a974f7ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maypoin.ru/award?keyword=biophysics+demystified+pdf PDF link annotation
    • http://uaregroup.com/best_strategies_for_forex_swing_tradingw7w88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_601f376a86a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5ff78c6a6dc69.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/nikulikuwawoboda.pdfIn PDF document text
    • http://anyita.space/minecraft_pc_free_1._126m9xz.pdfIn PDF document text
    • http://deine-gabe.com/tiduxanedudu1yagi.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/hedging_forex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_602b454970624.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/62519345531.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/synonyms_and_antonyms_worksheets_for_3rd_graders.pdfIn PDF document text
    • http://luminar4-download.xyz/arkansas_drivers_license_document_requirements9cc0x.pdfIn PDF document text
    • https://cdn.sqhk.co/godanalumado/cha0hdy/25428897030.pdfIn PDF document text
    • http://copytoshka.ru/the_lightning_thief_audiobook_chapter_4ymuba.pdfIn PDF document text
    • http://axecheat9.xyz/wapifeziudtif.pdfIn PDF document text
    • http://makeyourself.xyz/christmas_jazz_piano_sheet_music_freecxkss.pdfIn PDF document text
    • http://wide-do.top/tadademepisilabazistbo4.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/dicij0q/makopavazupetimekezodut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5feb0dc32661a.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/sex_lab_aroused_reduxgze0f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/njjpjd8/76722877699.pdfIn PDF document text
    • http://forexgeeks.net/ted_bundy_movie1qg33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roporuti.onlinewebshop.net/79305340524.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/gixirolulodozeziw.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/what_are_thirty_one_bags_made_of.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/62175216825.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/zamijar.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/11876430600.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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 5208 bytes
SHA-256: 788a3ba2ce40de1928d60ecbb96813c2aee2b8c34c1987b7ffc2d98bf128962f
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10208 bytes
SHA-256: 931a9a41f1229884e206346d3a96305c0dc4eee44c15dc1799a36ce5996192f5

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