Malicious PDF — malware analysis report

Static analysis result for SHA-256 424484cff7bb18a2…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 02:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86bf717f8e8ee9259e700c51f53ca6e2 SHA-1: b71751b6bbc01da26c041cbdd804366fe54e4d57 SHA-256: 424484cff7bb18a257055b345a69f973d0fab00c911161a2503b2a2ffe637dbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. Heuristics confirm this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly indicate maliciousness. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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://fokemale.ru/strik?utm_term=sa+white+book+pdf PDF link annotation
    • https://cdn.sqhk.co/gasukatebu/h0Vuld3/nasa_space_colony_interior_design.pdfIn PDF document text
    • http://wuwudikosegukem.mypressonline.com/history_of_the_ashanti_kingdom.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/aJMZbzA/cars_for_sale_under_5_000_nsw.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/64610510291.pdfIn PDF document text
    • http://vodoroding.info/69254109079rdvqt.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/cLjdzjb/golden_state_warriors_throwback_logo.pdfIn PDF document text
    • http://choosemadam.site/dolatofib25t6.pdfIn PDF document text
    • http://skidki-day.store/zukezutilrn4iu.pdfIn PDF document text
    • http://dovulup.iblogger.org/68887057813.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/21527312517.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/kindle_file_format_to.pdfIn PDF document text
    • http://heliusdesign.ru/jekitiviv4vqe.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/b5d0c61d-a737-4bcc-b667-04ad119507fa/4564953992.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/bahubali_movie_song_320kbps_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7496e0-79aa-4f29-8d2a-d2bf2bc4ded1/vudame.pdfIn PDF document text
    • http://ganenimipoje.epizy.com/32575440658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb7a379-33bd-4612-98d5-6a2d0bb311c8/juwobaromosib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44eede84-3282-4b65-a64e-de240cefe4c6/rhino_tutorials_architecture.pdfIn PDF document text
    • http://nunitew.rf.gd/house_builder_template_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/video_er_reddit_bot.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_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 5224 bytes
SHA-256: b4877ab8e1df833819f1bb22e1b548a13d305721c07efcf75b7b395907bcd2e6
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 11684 bytes
SHA-256: 5d4dd09ef45a61b2085f57f6eec970848d4ec519973ceffeaa586aaabd099512

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