Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0cc7cfff9075e7…

MALICIOUS

PDF

76.6 KB Created: 2021-03-29 02:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92d5a510397a73d358db36185ad72973 SHA-1: b887400a9029d1da50fc4bd5b709aca64316aab8 SHA-256: fa0cc7cfff9075e71eb01e95544356a9f7b85534674b01a3f7747d5e0f0dd824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://dafemum.ru/aws?utm_term=how+to+fix+a+cracked+rca+tablet+screen PDF link annotation
    • http://sugebowupubixo.mypressonline.com/54982187978.pdfIn PDF document text
    • http://tanenabav.getenjoyment.net/bumipixuxenagubip.pdfIn PDF document text
    • http://trysalon.xyz/killing_pablo_movie_trailera2kg5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff31e5ef27b8.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/d_and_d_delivery.pdfIn PDF document text
    • http://tersq.space/rupojosugepagemsdhhw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_603480e2694f6.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikifefisu/jhbhiif/aiou_admission_form_for_continue_students_ba.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/dgge3ii/wp-_nextbike_gmbh_leipzig_000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_6014bc4164719.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/why_am_i_obsessed_with_south_korea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481291/normal_5ff2dbafabc10.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/ib_biology_textbook_oxford.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/WDghfdi/meditation_music_app_android_free.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/psycho_book_bates_motel.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/dipafuxe/numikajuni.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/samsung_android_games_apps.pdfIn PDF document text
    • http://visevagopar.onlinewebshop.net/business_communication_notes_for_bca.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/drunken_boxing_techniques.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_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 5340 bytes
SHA-256: 7624891c44af4855c832de8d9dc8db9a0acb3dbb55105b91a677fe315c4b24ae
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 11044 bytes
SHA-256: 85dddec51ea829f4dd092178946f7b9f88b0f2bdbb3f81b74b415e1e6d8edd5c