Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9daea0befbaedb…

MALICIOUS

PDF

68.1 KB Created: 2021-02-28 12:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 116fac4a61cac5084b7d08174cfec499 SHA-1: 2b094ebbcb36a886ec6cd82736b1979456905117 SHA-256: fa9daea0befbaedbffc6e1f32a73089f7b68dbe289f580273b317c78dd8b9220
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://pelibifir.ru/strik?utm_term=introduction+to+modern+cryptography+solutions+pdf PDF link annotation
    • http://kudukudimox.sportsontheweb.net/94175688809.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/iigchd1/99931774285.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/city_of_fallen_angels_book_about_venice.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/the_odyssey_fagles_edition.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/99648989600.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/hTjd2gg/adult_coloring_books_michaels.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/gjhhwRV/gobufukulomofapejem.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/constellation_map_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/bjfibLm/kokibanebajebukasixa.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/ehigche/pubg_sensitivity_settings_for_mobile_2020_with_gyroscope.pdfIn PDF document text
    • https://feroraja.weebly.com/uploads/1/3/0/9/130969346/wugifibusa.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/2icijtg/paper_folding_origami.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/602615.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/6c3346b983.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/wefuxile.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jFQgfKq/39508205470.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/higiffp/app_screen_recorder_laptop.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/dufekifaral/gusojelukegesafe.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/resident_evil_5_game_for_android_phone.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/irobot_braava_jet_cleaning_solution_alternative.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/dufutegajomizogepobelim.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/72740388197.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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 5608 bytes
SHA-256: f28bfe3636c3918901f1f8f221d7aa35ceb4d1babd5bea020ef04be815e7a91f
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10376 bytes
SHA-256: 4d34f9736b61625d31c311e080fc93514a9b138424aa75bc70576199d421c0c7

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