Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfd4d7d55fecc16…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 22:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3112aa3709adddc41dd43af3505837ec SHA-1: dbbbd526ae12e0e6a4addc3dd5bdd5e3dfe971e7 SHA-256: 1dfd4d7d55fecc16e9d8e1cff4f3f3b3786ecfe2867cc38b49021d6f6516ccc2
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-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://maypoin.ru/strik?utm_term=is+roku+2+xs+still+supported PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489588/normal_5ff237556297a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_602fef1112597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fe9577b6c6a2.pdfIn PDF document text
    • http://limons.space/pasos_para_hacer_un_bosquejo_de_plan_de_vida66r1v.pdfIn PDF document text
    • http://com-connexion.xyz/92900731006g93l5.pdfIn PDF document text
    • http://podarokinsta.online/long_hair_beauty_princess_makeup_party_gamekveqb.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/9474185910.pdfIn PDF document text
    • http://winoorama.space/golds_gym_treadmill_lubricant8fd2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_604cda0c52fc1.pdfIn PDF document text
    • http://ing-cliente.com/vajidoluduk6o3if.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_789e7ad83f90428c9a2e3167cdf43029.pdf?index=trueIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/xuzawituzado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253c1de0-7eb7-425a-8dd8-b3f1f67736bc/79617705119.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/95352226432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490f81c0-c934-41e0-b7f2-b96c99d79d93/three_billy_goats_gruff_story_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532e27a7-31fb-4f3a-84d7-67be5c5d468b/how_to_change_my_logitech_mouse_settings.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f8b0fae72e204a3d997c82000404e372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e726a3-bbdf-405d-a520-2644b705ea42/act_comma_practice_worksheet_answer_key.pdfIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/marriage_certificate_form_madhya_pradesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf1c355-12df-4133-b186-96540716eb02/67340003392.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_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 4944 bytes
SHA-256: a13d1804b65285786cf95dbb26bf48f8b0329c21ab2eb7056509efb8be7e24c0
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10604 bytes
SHA-256: 431603556caab8431642db694b9eba674b5b8d71a49005a565ddb745ea115159

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