Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4b5007a3389e17…

MALICIOUS

PDF

76.9 KB Created: 2021-03-03 23:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c50eb0673520a3c64b3ce57d8f7dfcc SHA-1: 109c94eb4d0a2f79d21087d4ee771449f5a8c07f SHA-256: ce4b5007a3389e17253d0584fd1506a8a3311252b854cb4ce9fa48daa732fbc9
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 0.9996

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
  • 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://druttle.ru/aws?utm_term=que+es+relevancia+en+diccionario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499653/normal_601bd6ed59363.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/jaiazge/lokawajedoroxogejegerutub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_5fd2c1b5823b3.pdfIn PDF document text
    • http://lufatomitonad.22web.org/mailing_label_template.pdfIn PDF document text
    • http://wspring.space/tabla_periodica_de_los_elementos_quimicos_completa_para_imprimird5slj.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/e8ghgds/cordial_meaning_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_5fd148c41d5c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff27fe394f73.pdfIn PDF document text
    • http://instapriz.online/film_action_full_movies_3gpy6son.pdfIn PDF document text
    • http://mushygushysayings.com/kefagewijmvuk.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/iij2hcU/nofenuzabefugagud.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/1w7PWjb/affirmative_action_definition_ap_gov.pdfIn PDF document text
    • http://foyou.store/xorasozelisozolafuenvr0.pdfIn PDF document text
    • http://org-fruit.space/fegixhpvo9.pdfIn PDF document text
    • http://electrumwallet.buzz/battlefront_2_2005pqaf8.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/fjajajb/download_world_war_conqueror_4_mod_apk.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/zuwosil/90655784517.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/avery_labels_template_l7159.pdfIn PDF document text
    • http://jeduvuvojupan.rf.gd/myanmar_islamic_books_free.pdfIn PDF document text
    • http://xosabunaledepof.rf.gd/74099485479.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/free_episodes_girlfriends_guide_to_divorce.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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 5052 bytes
SHA-256: cd9ca298c99d874585cde63eebf91205eede9da20c91cc92329ac706b6d43a5d
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 12136 bytes
SHA-256: f7127daddf1d5eb1aeed3ee500c394a3d94068eafb43c5c55ce99d7d81c45cd9

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