Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d9ef538936aec…

MALICIOUS

PDF

79.3 KB Created: 2021-03-26 07:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: baed35d978671d24923d42339d1a1880 SHA-1: 59848f8c25f361dc6cbdc42452c87f852175498b SHA-256: 631d9ef538936aece3e4e915d01abc0b2871a295b55f84d4c0627e5f13b80949
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 0.9993

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://mezovuduw.ru/strik?utm_term=rca+tablet+reviews PDF link annotation
    • https://cdn.sqhk.co/womilepeba/ifKzieK/kozukobavekodi.pdfIn PDF document text
    • http://instapriz.online/most_important_wilderness_survival_skillsnyai3.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/98811224604.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/refraction_of_light_notes.pdfIn PDF document text
    • http://kernig.pro/why_premiere_pro_no_soundwzbmr.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/x0gggee/64111249045.pdfIn PDF document text
    • http://espaceabonne.com/befukanawijolojidujajuga05f6g.pdfIn PDF document text
    • http://xalufabo.iblogger.org/affiliate_website_templates_free.pdfIn PDF document text
    • http://itsnat.space/what_is_the_moral_of_the_wolf_and_the_cranec10x1.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/378353596n89kb.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/huijy8T/fishing_online_shop_usa.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/86944253066.pdfIn PDF document text
    • https://cdn.sqhk.co/modesarox/heDmeje/69116442458.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/7c1c6ed1-8cf8-447d-9d29-4a8bb47f73c6/how_to_use_carpet_and_upholstery_cleaner.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_5407117ec70140ceb8895c84ba0b53b2.pdf?index=trueIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_6514942d6a614354a50dee6bfaf5a537.pdf?index=trueIn PDF document text
    • http://buzumigasox.myartsonline.com/sri_aurobindo_ghosh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9845f83e-f2f6-4fd2-9b41-bbb779ccddf4/kaplan_asvab_2020_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491fbdcb-ed28-4896-831d-93fda2da4e82/why_wont_directv_remote_work.pdfIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_e5d70b2a8492480387726ff600a5da4f.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_d82dc35949214093b85185e452b8e0a7.pdf?index=trueIn PDF document text
    • http://biwisuzasasare.rf.gd/cheat_sheet_app_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c65410-1fe4-44db-b070-bba90c3a1e0f/88812200267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c41ee53-567d-4aaa-a581-ac4fa4e0c8f6/how_to_use_wet_dry_vacuum_for_water.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_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 5092 bytes
SHA-256: 66c7dd347b01369fe4391bb78b85c862c2134feb3e71d6d40f47196ef160227d
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10860 bytes
SHA-256: b2772fee376a5d0a4ef4555cc69b53f792bde3d4486e4dc49386af38ea95f42c

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