Malicious PDF — malware analysis report

Static analysis result for SHA-256 724b10c06d43f25c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 16:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f01f26de315e6777cd29183346370a18 SHA-1: b6bccca5839d733ac0d1cdf2fbb7d97de8a7c299 SHA-256: 724b10c06d43f25cb4e833fda2e6c3862ac10cfd142f69308cf2288bc7af39e9
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 0.9997

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=voice+training+course+pdf PDF link annotation
    • http://help-copyrighteamservice.com/510525740294etwq.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/mabodonize.pdfIn PDF document text
    • http://scriptbook.xyz/figorasotajibiwonetozumuuyhij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_603e2c4e402e3.pdfIn PDF document text
    • http://kukushpa.fun/alpha_omega_elite_car_seat_cover_installationpis91.pdfIn PDF document text
    • http://paktum.pro/xfinity_xr15_remote_not_working_with_cable_boxnhrjc.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/iaoONhf/dark_side_of_the_moon_vinyl.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/free_video_call_recorder_for_skype_gezginlerc32qr.pdfIn PDF document text
    • http://craftsmansmetics.com/ceramic_craft_supplies_brisbanez2i6f.pdfIn PDF document text
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/pakizizozajuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fe230db495c2.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/jdiibtq/exorbitant_in_a_sentence.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/8368920.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/0bZjjol/ultimate_off_road_camper_review.pdfIn PDF document text
    • http://requiredjokblog.com/maths_tricky_quiz_questions_and_answers1u091.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/71fe6.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/mesixadelomomo/chicago_cubs_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/bible_verses_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/how_do_mind_maps_help_students.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/torote.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/23157065439.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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5256 bytes
SHA-256: 36cceb6bf3a5850fb8dd2faa298413e51cf7fd248b89f03bd0918dfa75b249b8
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11076 bytes
SHA-256: 09cb49c3102443395aa648bc7bf1213579073bdad1a5c654244191a26d3c1935

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