Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f1ff4a052d99ff…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 19:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2cbf52b7e22bce1358ee73f41e2e91e0 SHA-1: 8de90fa33a33907bfb5d393d7e2f172c562bc100 SHA-256: f7f1ff4a052d99ff9da6a27a7f741fa58a59a5fa2e7bb9db76f5ac14e965ba10
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as search results, with the primary lure being 'Harry Potter book collection set hardcover'. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

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://nipisod.ru/strik?utm_term=harry+potter+book+collection+set+hardcover PDF link annotation
    • http://leledup.mypressonline.com/how_long_does_honda_car_service_take.pdfIn PDF document text
    • http://sallehq.xyz/377177370498f6qr.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/i8jg279/rabizaletajajeje.pdfIn PDF document text
    • http://smilex.club/rings_a_bell_synonym_idiom3upbs.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jLBS0hd/cartoon_cat_mod_minecraft_pc.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/methods_of_transistor_biasing.pdfIn PDF document text
    • http://nesobaka9.xyz/which_intermolecular_forces_are_found_in_hydrogen_fluoridey6xoj.pdfIn PDF document text
    • http://shopwithsale.website/sears_craftsman_1_2_hp_garage_door_opener_replacement_partsybagk.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/neurological_diseases_list.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/97454664047.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/26012179446.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/calculate_the_centroid_of_the_shaded_area_with_respect_to_the_x-axis_and_to_the_y-axis.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/jg7Wibc/modern_redstone_house_minecraft_pe.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/why_is_my_desktop_not_showing_icons.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/cestodos_veterinaria.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/nafoniwedafazej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebojivim.myartsonline.com/22388663319.pdfIn PDF document text
    • http://medexode.atwebpages.com/todos_los_nombres_biblicos_de_dios_y_su_significado.pdfIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/mandalas_para_colorear_adultos.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_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 5488 bytes
SHA-256: 886d2e14f2dc87338689985fbec127aa5036a1d79afc82e4fef2628b8b833cf1
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 12604 bytes
SHA-256: 647f7138391337dd886f416f8060daca22375ce97e30c8b723ecc4c57812c46b

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