Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d2d53d38243ffd…

MALICIOUS

PDF

83.6 KB Created: 2021-03-25 08:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6577ca6fdb789d6177d59234d0d3fcc8 SHA-1: 550edd1d94b362854730c4addc8684934af3532f SHA-256: f5d2d53d38243ffdd85b2e872627dc2d6c0a316f8262787e3eee2d693a8e0c0c
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://dafemum.ru/wix?keyword=middle+ages+review+crossword+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477638/normal_60146a0d2089c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_60256da9409c4.pdfIn PDF document text
    • http://mibenovapus.22web.org/vogokokigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fc6890d1fc41.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/zusonilusojofuwojipuro.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/kenneth_cole_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5ff59ef4651e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fd8bb8e1c62b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotejujuzobok.rf.gd/after_anna_todd_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e52a24d-2184-4fa7-a859-860355ef4bca/37926646852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c94878-721d-448c-9a0b-73f0110ae1fe/world_war_z_crossplay_game_chat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a837c1-8319-4095-bbf4-2d123b6bd657/is_it_possible_to_learn_python_in_a_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89afd58-fb32-4720-ad0a-06e0e36a3750/is_there_anything_at_taco_bell_thats_keto_friendly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18134fa3-dce8-4f41-9b81-615035a04b58/vifubizulijefavubige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faf292d-966e-4c0c-bc85-f9ccf572dc20/kipajasonebal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81916d20-f11d-4ae8-b625-387fb3317764/58827365855.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/xolaxafaweluwakijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19230fb-6e56-4606-b7fc-93bab9a0c20d/the_very_busy_spider_activities_printables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2981a7-3517-46a1-ab13-62da5d828cf3/verbos_regulares_en_espanol.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_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 5264 bytes
SHA-256: ec4f3e9a34364801cdf7a723aeb26a910aff9a522b3c53aaf6934f048312012d
font_01_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 11236 bytes
SHA-256: 0773edfa4518137bd8a081ac5c055f82009d414040894689d9948f27cb1fb30c

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