Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bf53321c219383…

MALICIOUS

PDF

79.9 KB Created: 2021-04-07 18:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e744476cd9853302662e96122c5a636d SHA-1: c82fd047ea8dcacb4a709a3886d548b0c048c726 SHA-256: a1bf53321c219383ba937376b6c05a28fee44c493240e1adf941516a1b7e9997
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=an+ember+in+the+ashes+series+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455399/normal_600c454ba080c.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/zetilelegidopi_dosam_wubuvefuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384039/normal_5ffea8373de5d.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/is_nj_transit_monthly_pass_round_trip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_602dc77ce349b.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gfRijhc/extreme_car_driving_simulator_2018_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/jjNhcBi/23267534360.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/ieiahe8/bsnl_unlimited_talktime_offer_tamilnadu.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/4244552.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/26816188539.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/java_aptitude_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_6038f5ef4f1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/juzjf6V/movistar_el_salvador_promociones_de_celulares.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_60201c6f47574.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/ragajuraweziboku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea970fb-4d3c-401b-b9ce-77c1822de547/can_you_get_roblox_vr_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2a3ee8-446c-44f1-94be-433bed1fdd38/motorola_apx_6000_manual.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/official_gre_verbal_reasoning_practice_questions_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571278af-dad7-4893-aec5-e15c187eb95d/betazofowosabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f67905c-5e84-4921-9435-aabc3ec58da8/lesulij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04504f94-c180-47da-b015-fb8d1e4adee7/xitisa.pdfIn PDF document text
    • http://zijurape.atwebpages.com/99521751964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af77e6d-b71a-41d0-a933-dd3ba0b6cc84/ti_nspire_cx_cas_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442ddb65-091d-4a73-91e9-96a9e1177dce/febazisatisivaf.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_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 5136 bytes
SHA-256: 3639a0d98bcb6dd4a5336915144fabdec3afa697702812070df868039b35ce8e
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 10904 bytes
SHA-256: a373e17b497a1e4105f7683b0b6580f31eabc15a5d36e9b0da1813b646d19207