Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c23769d65b3830c…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 13:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ccdab10449f0c8aaafc56659166ee545 SHA-1: b14c5bf7648113062f8ee24e74136d5d14951dca SHA-256: 2c23769d65b3830c734664cfd7a328dacfd9c32e12f2dff33033e3a37bfcd2f3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/award?keyword=disadvantages+of+absorption+costing+pdf PDF link annotation
    • http://nurigoluda.mygamesonline.org/totuginolodigufurave.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/ross_stores_open_near_me_right_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fe7921048b7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485695/normal_5ff4b908200ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_603fefb562492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_603c742f017b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601cf9e7f367f.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/glencoe_geometry_chapter_4_quiz_2_answer_keyaf8k7.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/philip_kotler_marketing_management_book_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_6004bcee92597.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/glass_sword_quotes.pdfIn PDF document text
    • http://ottics.ru/why_does_my_bluetooth_headset_keep_disconnecting_from_my_iphonexwwqz.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/larugewudigv0cox.pdfIn PDF document text
    • http://nefritthebestthing.site/forbidden_tabitha_suzuma_plotk226z.pdfIn PDF document text
    • http://taptopbot.com/blueprint_to_mass_phase_2ddzqz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/domudoxisasojugavidine.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/barista_resume_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/free_adobe_flash_player_win_10.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ee22ede8d92f41eb93181e1dbdd07693.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/furnace_heat_exchanger_cracked_replace_or_repair.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_240e2a57f2c244e5ac9e7127b6d0968d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/nubozawegu.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5492 bytes
SHA-256: 5ce60871d66331c1cfead7a3bfe5ee1a95c5dd81dbe123682519af7c560623a6
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10548 bytes
SHA-256: 0f6cc6541e7083cee35b10857c438ceb3cdb166c61726cb7ab12c7138593101d