Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc0d88186373f09…

MALICIOUS

PDF

90.4 KB Created: 2021-06-09 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ac0c153b32934d2319b7309639510e97 SHA-1: d2262882a8b2860e64eb389190cfcb17523bdd4d SHA-256: dbc0d88186373f098a88191ee638c72ea50abf7e73e181d90eb2f34255a24a87
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/pbw?utm_term=online+ds+emulator+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470825/normal_603c51f04f5dd.pdfIn PDF document text
    • https://febodume.weebly.com/uploads/1/3/2/8/132815732/444257.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/vagekekapug.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/sezujes_zikalodirozimut_besusozud_pipexeloxezaje.pdfIn PDF document text
    • https://dowanudamedi.weebly.com/uploads/1/3/1/3/131398164/xasitaruxa_latexiridib_sunapigedef_jadonijemiwuniv.pdfIn PDF document text
    • https://gixosakovi.weebly.com/uploads/1/3/4/6/134677645/garasubenejemawi.pdfIn PDF document text
    • https://vamukeroke.weebly.com/uploads/1/3/4/3/134353023/tamapa_xotexokuluma_bokofevu_zeziposepel.pdfIn PDF document text
    • https://nabatiniwoz.weebly.com/uploads/1/3/4/8/134889778/957df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_60158ced13449.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/5b1e2cb2178d6.pdfIn PDF document text
    • https://lodiwuziwinum.weebly.com/uploads/1/3/4/5/134502140/6032794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovovojufa.pbworks.com/f/soul_knight_weapon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3419eda-347c-433c-8b5e-a03639e9c422/xejotak.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/empower_c1_students_book.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144538272/periodic_trends_worksheet_answer_key_pogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bee024f-eee6-46e8-8a7d-a75d6c025318/constellation_map_northern_hemisphere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5924ca3-2126-47b3-a9d2-45b7b0ac09f8/613084036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dec9147-0a04-46fa-8373-6cb5646eb11c/fight_club_2b2t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9d2838-db1b-47dc-9eb5-1ceb68c23767/nigiragim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfa264f-d91c-454c-be30-e27700deebb0/gta_sa_doraemon_mod_with_nobita_house_for_android_game_download_apkpure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 5000 bytes
SHA-256: d0aa5732520bbcc2d7b59bb776317873d914c32f9753cb2a057edb43cc2f8e12
font_01_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 11572 bytes
SHA-256: 17e667e7a740961b69dd8cf6d763874823b0b37f1f2210042541de8d3ad5f383
font_02_sfnt_off00014606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14606 16348 bytes
SHA-256: 44344d777475bc27302cf71c6ce9e96b5edcb3cf6b8673c7cacff1863add0d01