Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f590f31eb63036…

MALICIOUS

PDF

75.0 KB Created: 2021-06-06 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e9b94198796db63bf90bcbc2e4eeee7b SHA-1: d9a6614a7682af0cf671d2088afb1c4e4d81cba5 SHA-256: 44f590f31eb63036f3b5be3e233ef5fa2a07466763b50d32a1aedf1fb6142999
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://archism.ru/pbw?utm_term=vienna+travel+map+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5ffcfc8916141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_601dbbb4f36e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fffe968b73fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natetusiwuwo.pbworks.com/f/complete_and_incomplete_sentences_worksheet_with_answers.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144577071/79720413804.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144706629/pokemon_emerald_for_gba_download.pdfIn PDF document text
    • http://jazonewu.pbworks.com/w/file/fetch/144693804/13421201582.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144612180/how_do_i_reset_my_logitech_h600_headset.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144579999/jatawer.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144576237/fnaf_4_unblocked_full_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce76285-ad51-4098-b415-949816a97f9a/install_goalrilla_in_ground_basketball_hoop.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144617553/how_to_install_onn_tilting_tv_wall_mount_47-80.pdfIn PDF document text
    • http://buwutel.pbworks.com/w/file/fetch/144686772/2003_jaguar_x_type_owners_manual.pdfIn PDF document text
    • http://jubujefaj.pbworks.com/w/file/fetch/144625494/rabagikasezunenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9ed377-8c6e-465d-b2d8-9251ca48d841/25892387825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c202b4e-7428-48fb-93b5-3aea1607dfc9/tipusiwosagez.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144460743/nidigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cbc446-169e-458c-9786-4eadbe1daf92/88517079399.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/vilub.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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5036 bytes
SHA-256: 3790a555b42764dce0a600d9d623d15dd39a68b5c9d7bdde2ce93f59eb7bbc5e
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11036 bytes
SHA-256: 5d3edd620e216b6ea2f1183b4af6bf8e201e1ec98216ed28687a20251bb84fe8

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