Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d42e937e4d4b30…

MALICIOUS

PDF

68.0 KB Created: 2021-05-11 15:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a0d79741262ef23168237a644e25826 SHA-1: 19a123d9b89f23b3bd2813760e5f7f49fd0a5be6 SHA-256: 90d42e937e4d4b30a133e4c25f5a49078f7cda2bd8070c2831cb85e858c124ba
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://xajibur.ru/strik?utm_term=how+do+you+skip+count+by+sevens PDF link annotation
    • http://4escam-bot.online/43741719596mrg5j.pdfIn PDF document text
    • http://blancop.xyz/sony_xplod_1200_watt_2_channel_ampl61ja.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/a_garden_for_the_house_recipes.pdfIn PDF document text
    • http://teatr-art.com/is_sonic_breakfast_burrito_healthykr5wo.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/tutogaxar.pdfIn PDF document text
    • http://load-bcp.com/how_to_landscape_a_slope_on_a_budgetv84qw.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://autokenn.com/87297051614u5qv.pdfIn PDF document text
    • http://pr-bux.online/axial_scx10_jeep_wrangler_unlimited_rubicon_rtrf2r6v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea086a32-63a8-44df-978d-b4293ccc57ac/15351434646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da22eafa-fd5a-4579-ab1c-83c3e865ee0b/hmong_history_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14634235-2069-44ee-8cdd-7e91f9b1116a/kiwikozetijepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af37180-6a4f-44ab-9097-3d0244d2b21a/pozaweperemofijuvobe.pdfIn PDF document text
    • http://ropasibemufi.epizy.com/10544962761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab96132-dcdf-4343-a923-f926363066e2/2078371618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775faf7c-7e78-41ae-977b-0e3221240e61/35986340153.pdfIn PDF document text
    • http://lutonidem.rf.gd/acca_past_papers_f7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f949f187-32a6-4537-b737-4cf7a2ae609b/survival_medicine_handbook_barnes_and_noble.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/bekusefetufov.pdfIn PDF document text
    • http://kataribijinezej.epizy.com/jakuredavijosalajofo.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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 5148 bytes
SHA-256: 6535b1de231231f07e7d040ca3653a849ce9acbb93e486fe6297e56d49a55783
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10328 bytes
SHA-256: e75200111f4d55165bdd0b4fd81dff6c35e8c73ccf8b232d56ea4fa117b0441c

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