Malicious PDF — malware analysis report

Static analysis result for SHA-256 446924a44bb573c5…

MALICIOUS

PDF

80.1 KB Created: 2021-03-05 04:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 18648b1ffa7587b2cf50a1e8cf1a5601 SHA-1: b75d7a9a1195196c879dbcd064d2217f3e711308 SHA-256: 446924a44bb573c5fd9b1c9fdee3487fd4665191545adeb577acdd14aaebf027
156 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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=math+kangaroo+usa+questions PDF link annotation
    • https://cdn.sqhk.co/nivunufozub/iiibhcD/xutorewo.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/fijewisibusebe_pobokakatajibo_rupebut.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/ihhgJhf/emulador_de_juegos_retro_para_android.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/furiluw.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/DhbwBr2/tusozowivonidozopegen.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/6hehbia/top_5_popular_tik_tok_ringtones_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/jZ3BicZ/nalozevij.pdfIn PDF document text
    • https://felojabok.weebly.com/uploads/1/3/0/7/130739263/2537755.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/fgdihfD/airport_madness_3d_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/AfihzzB/sexojadejidafusu.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/ghQwjhx/3d_origami_dragon_dinosaur_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/fPjiehi/talismanic_incantation_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/bbichgN/ifixit_new_3ds_xl_top_screen.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/besadijarasi.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/RkTZtib/zitodipusalefifurelodere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/farefasejikap/45838643039.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/canon_eos_4000d_dslr_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/how_do_you_multiply_and_divide_in_one_excel_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/fupekumawizosufug.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/temezit.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/2nd_grade_math_sols_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/62802446158.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 4992 bytes
SHA-256: 11b470db26315ab0d521ce8dea77a132f95d46f718758edd22951b575f55116a
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 10704 bytes
SHA-256: fff61cdd195449b6946a097866a5f121ac3fca6592c4e037613a9a31f024d0d0
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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