Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8caf5776363e2a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 08:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2bc1c8c00bdf26210bd9e1995adaade0 SHA-1: 23aa55137da1c8be126716253ba95d0eea1f3e41 SHA-256: 1d8caf5776363e2a47825d48832548475116f6d0b46ee995259271a8bc9a3a64
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=what+is+nuclear+stability+in+physics In PDF document text
    • https://cdn.sqhk.co/menodotitit/Sjd5kih/valgame_dios_novela_capitulos_completos.pdfIn PDF document text
    • http://tpdreport.com/sony_trinitron_tv_pricenc0b0.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/gepal.pdfIn PDF document text
    • http://idealicagocce.site/50897596273wgji4.pdfIn PDF document text
    • http://table-wait.com/lixobowudaz2ciun.pdfIn PDF document text
    • http://titanovyi-filtr.ru/educational_psychology_book_in_urduw915l.pdfIn PDF document text
    • http://poverkavoda.website/caroline_lowe_news_reporterfk6xk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/gghijca/slice_n_dice_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/Ohi1JXN/sodurogagowuwufara.pdfIn PDF document text
    • http://kevufeduwatawos.mypressonline.com/notadeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/delighting_in_the_trinity_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/iowa_dot_sheet_numbering.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_bdf172b81a9049f2b289be08e1a81aef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/18534383002.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/mejefiwisurikoge.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/happy_birthday_sheet_music_for_flute.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_0339f27faf654e6cb5047e63e84abd1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/apple_configurator_2_dmg.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_943dca433f344f25abe3b37628c0e9c7.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_b6a64c8339c440afba11f4f755783774.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/91664628135.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_55188f549cd846eb8fc7fbcd654cc325.pdf?index=trueIn 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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 5276 bytes
SHA-256: ba2c7ba34e43b27546b8e53688524cdb44c798c9aefedf1bb96b58cfe02d9514
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 11216 bytes
SHA-256: ee533af57d49cb3aa75962708949e767c20c44fb2ca7db4e0e570c8b6ce36e02

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