Malicious PDF — malware analysis report

Static analysis result for SHA-256 307558a3820f66fa…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 00:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ecb254bd9c57e11e804038b35bab845f SHA-1: 2c8beac66a382b6ac875850b90b32f78bb0719d4 SHA-256: 307558a3820f66fa104f2faf0a63d78f78281ef2611927a5886145d0c78fdbe2
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://druttle.ru/123?utm_term=sheet+metal+deep+drawing+process+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489251/normal_60138113c99db.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/lafesisaximenazewoneva.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/niduperupageniwedutax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_6068d8208dcc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_603ad458c87c9.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/what_does_yellow_light_mean_on_belkin_wifi_extender.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/sulapevubepofuzakit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd934e75b6ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagofij.onlinewebshop.net/19618817923.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/36087758931.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/scosche_fm_transmitter_stopped_working.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/cambridge_secondary_1_progression_test_past_papers_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b95bd2-3415-4f64-8ebc-496efbae4182/la_ciudad_de_las_bestias_resumen_capitulo_15.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/medical_dictionary_oxford.pdfIn PDF document text
    • http://zimopup.myartsonline.com/model_3_overnight_range_loss.pdfIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/fufojomoju.pdfIn PDF document text
    • http://batapijas.myartsonline.com/gikules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78346263-6f40-4b6a-b48a-58bc95bec5af/do_smart_meters_cause_radiation.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/p_r_letter_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/50450754927.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5764 bytes
SHA-256: 85ac25886164b3a54f5fb53340facf4d523e7f8d7abcf0119a5a3495a6832cec
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10728 bytes
SHA-256: 6662f3c6e0f33026515f9db2dd6d4de7148cd35c7c8ba36214172d80c72c7d67

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