Malicious PDF — malware analysis report

Static analysis result for SHA-256 02829cb67fece7e8…

MALICIOUS

PDF

85.5 KB Created: 2021-03-29 05:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a4d2d57c1ca818041a19eeb57dd9d21 SHA-1: a23bc26de1450bb09ce129e66733dd8dc9eae399 SHA-256: 02829cb67fece7e8a7365fa212eec27252edbfdcbdf719f538e01e6ee9493e3f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. Several of these links point to unknown or potentially malicious domains, including 'bologen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=murray+manual+transfer+switch
    • http://nogurufegu.mygamesonline.org/35375029880.pdf
    • http://rumepado.mypressonline.com/lelavetozifodabumo.pdf
    • http://dalosizofovabes.medianewsonline.com/33949945832.pdf
    • http://subuxiwubemew.getenjoyment.net/powerdirector_14_keygen.pdf
    • http://vamolufu.getenjoyment.net/vupamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nalifij/fosinenodedotobugeb.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_a59b9e5544614ba9b90bb6c7756cff22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc8eb644-20b7-4428-a357-104055887857/the_10_000_year_explosion_by_cochran_and_harpending.pdf
    • https://s3.amazonaws.com/bodajaku/alarm_song_ringtone_free.pdf
    • https://s3.amazonaws.com/xijalovelokolep/mosilemifesonorejoxenos.pdf
    • https://uploads.strikinglycdn.com/files/62fee984-496b-4f50-948e-ba4b96e8b905/the_devil_wears_prada_quotes_book.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_482e4d1084fb47bab1258de02a9b0644.pdf?index=true
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_10ec678c2e0c4903820deb53f729300e.pdf?index=true
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_e67309ca559e4fac839c22f9741f87a1.pdf?index=true
    • https://s3.amazonaws.com/ganubatebedoxez/69595859404.pdf
    • https://s3.amazonaws.com/jedobufudajewu/82457340874.pdf
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_2704bb6e1d4343a49ef5e81bffc40c0c.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_a10f2833e2a34a5bb3f192960e0ac90d.pdf?index=true
    • https://s3.amazonaws.com/silubebebefuju/you_will_be_alright_meaning_in_tamil.pdf
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_a745898f183c446e83fc9ee367ea9b6f.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/annihilation_of_caste_book_by_ambedkar.pdf
    • https://s3.amazonaws.com/kiguteperilodu/cask_of_amontillado_vocabulary_quiz.pdf
    • https://uploads.strikinglycdn.com/files/17bdb71a-943f-4fe1-9cd5-ad9b843aaf6e/jopawilewalotun.pdf
    • https://s3.amazonaws.com/somisilegex/vijedisubugek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80c.bin
fd9169444819657ee541690d226a595a25e72fb4b31072905209931f3184bc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 5320 bytes
font_01_sfnt_off00010a1b.bin
51daa3d527ff64ff277407288bd04f546d50f15b2309837a5650b222f91c6b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 12120 bytes
font_02_sfnt_off00013217.bin
920cc5a0e257d721decf6a0abd60b1935e2cfcc78ad51883474d755595d4c906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 16324 bytes

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