Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22d9778fd0d6c13…

MALICIOUS

PDF

75.4 KB Created: 2021-03-14 08:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdf4d28f12674d88d018fd294044d4b0 SHA-1: 0ef15ae83b038074d8f4430553c5f8b1cabe89f4 SHA-256: b22d9778fd0d6c13886947fe327181b3f702ce96f158b037e12b6f100f9b91c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=waiting+for+godot+script+act+2+pdf PDF link annotation
    • https://gawejewigedek.weebly.com/uploads/1/3/2/7/132741035/gumivipapixato.pdfIn PDF document text
    • https://kuratoso.weebly.com/uploads/1/3/4/3/134329811/jepoxoramafuti.pdfIn PDF document text
    • http://best-ital.fun/platformio_atom_dependencies1pvaa.pdfIn PDF document text
    • http://swiss-gear.shop/july_2016_monthly_calendar_template4r749.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/hiVjjhc/drum_machine_program_for_windows_10.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/towugeb.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/Rjhijht/3677274954.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/jUiefiO/fetopu.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/hEtf1he/xujamoparajiriputelevo.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/7946267.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/usps_first_class_mail_international_tracking_indiagfryz.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/jfzMaif/vamopubafoduvowod.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/hb3hche/gorexiloboxosipeg.pdfIn PDF document text
    • http://samoe-samaya.ru/axial_scx10_ii_jeep_wrangler_parts4nb7m.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/dance_music_best_songs_of_20007j61r.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/Cghic8z/campagnolo_veloce_rear_derailleur_manual.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/zinekafo.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/pekatikisuruki/87343588949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5f783c-abaa-4b8d-8b73-e2c158e4fb2a/past_perfect_verb_tense_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/obra_de_teatro_un_tranvia_llamado_deseo.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/gogifoxutopinodirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195101a6-fa30-4713-92aa-de5e91798a2d/sap_fico_books.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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 5436 bytes
SHA-256: 53fbb0de19616f05709fd7fba115f0bb7562c6a94c06b283920ebe6e82886cc3
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 10160 bytes
SHA-256: 9f7f14481bd3afe291fdfab1ca7c45ebbba822c0b9884cbce91005ae17c26991

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