Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9bdd5754c17b05…

MALICIOUS

PDF

75.9 KB Created: 2021-02-04 04:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: de8522fa986ecee9ea649732c5190f82 SHA-1: e043b86890948e268a116427a18fcc68a809b857 SHA-256: ac9bdd5754c17b056d305d5a96227abd2e5c523aa697e24540b550223b7f48f5
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/123?utm_term=western+surety+company+texas PDF link annotation
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/2937d554cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd2f28894921.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/begidumimajuse-murigurasal-naboni.pdfIn PDF document text
    • http://pomulagija.iblogger.org/consolidate_worksheets_in_excel_macro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe42125b656c.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/icjdmjg/pixel_maker_studio_3ds_cia.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/SiajjuY/wowazurunizebujuzasixir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ff4af2c3b34b.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/vavid-maruxivapediw-wosokidimanozow.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/hhbjdUc/hyperion_launcher_pro_apk_v48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_5fdc5d00a2c59.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/mutirexa/guideline_value_in_coimbatore.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/birthday_invitation_templates_wording.pdfIn PDF document text
    • http://fevufanitefega.epizy.com/jabobinemopowabejawawek.pdfIn PDF document text
    • http://foxebunuref.epizy.com/beyond_light_years_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/divisibility_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/chamara_ranawaka_mihithalaya_album_free.pdfIn PDF document text
    • http://sexexunila.epizy.com/67148260701.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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 5064 bytes
SHA-256: 22aa159343c74f11d518d9f4109713c51d10687ae9a88f1e656669bbf323fed2
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10460 bytes
SHA-256: 2a36b85bd75c630a03e6a31d83e1457f048d1042406d918911fe352589988214
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c