Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4fc758bb4d8df1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 20:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b72258dfb111aadb0df4f401a776e780 SHA-1: 4eee08f8f77687576de8451d7ac501077fcd4094 SHA-256: fa4fc758bb4d8df1e80c94091fbe0f9160f3259fd034e9bfa72a09da0d14eabc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' firings. The primary IOC is a URL hosted on a disposable domain, likely part of a phishing or scam campaign. Although no scripts were explicitly extracted, the nature of the PDF and the embedded URLs suggest an attempt to redirect users to a malicious site, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=does+my+onkyo+receiver+support+arc PDF link annotation
    • http://wiboratiraveguw.mygamesonline.org/article_3_of_the_1987_philippine_constitution.pdfIn PDF document text
    • http://visovewefa.iblogger.org/what_are_cognitive_behavioral_skills.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/witexefememiwif.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/king_lear_movie_cast.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/nazapetuj-laberaride.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medemamonolusav.rf.gd/76444915547.pdfIn PDF document text
    • http://xuramilipadig.rf.gd/corel_draw_x6_kickass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2311ad7-e450-4667-936c-6ea2e4544249/someone_like_you_ukulele_fingerstyle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fe6d03-9c98-4c37-8197-c0062f1974b1/how_to_clean_filter_on_bissell_proheat_pet.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/83119866100.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/5479243681.pdfIn PDF document text
    • http://zadajipi.epizy.com/57212817333.pdfIn PDF document text
    • http://firuxafuxu.rf.gd/xisewali.pdfIn PDF document text
    • http://mafasegu.epizy.com/sheets_of_wood_laminate.pdfIn PDF document text
    • http://mamotupot.rf.gd/ctet_2019_paper_2_question_and_answer.pdfIn PDF document text
    • http://xowuxojugo.rf.gd/callan_method_book_1.pdfIn PDF document text
    • http://rufizugo.epizy.com/police_reports_campbelltown_nsw.pdfIn PDF document text
    • http://ronagipesi.rf.gd/72798481653.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/how_to_use_z_statistic_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb560b8-0a37-466a-9d52-c9ae23962228/energizer_battery_charger_manual_chvcm4.pdfIn PDF document text
    • http://genaligonunik.epizy.com/plantronics_backbeat_pro.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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 5272 bytes
SHA-256: b3b6e26e759a6d26786f45192f3df478c49556045f7110136a3c66da3b63dcbf
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 1936 bytes
SHA-256: 21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10780 bytes
SHA-256: 081dd49dc73439168c59de37886dda1dd5841263612eaa475a018d3c98566444

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