Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bec18765f5e134…

MALICIOUS

PDF

82.7 KB Created: 2021-03-14 05:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7611d29fb96f5c1bcaa885b2bf73fd7a SHA-1: 481963f4b8a52c6229d12312c3c5a1fa0921ebbf SHA-256: d1bec18765f5e13423c86037b32bf216cccc38df02e7291331239da62d35cc3e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=classic+wow+leatherworking+leveling+guide PDF link annotation
    • https://cdn.sqhk.co/nuzifixe/eDaoWXF/28624070188.pdfIn PDF document text
    • http://gufutaca6.xyz/the_complete_book_of_birthdays_dg4siu.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hgjbCgi/lirakixezimelupozalexogu.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/iiaWXFD/bowling_king_floating_ball_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/bVhg2v1/2518637218.pdfIn PDF document text
    • https://cdn.sqhk.co/zewulutaj/0d6gdhf/baasha_tamil_film_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_60384baba9bee.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/noxujif-sosad-kupepuw-xekosaro.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/fMELk4a/zero_matrix_vector_multiplication_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/Wjdvnhf/mujigugides.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jfghFhi/26110685788.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/agib0id/free_powerpoint_software.pdfIn PDF document text
    • http://national-verifyteam.com/prentice_hall_magruder27_s_american_government2ivd7.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/0iaZTVI/siberian_cat_size.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/jonoz.pdfIn PDF document text
    • http://obzorov.site/best_sql_books_for_beginners_2019nh0tr.pdfIn PDF document text
    • http://smcjd.com/cables_and_connectors_and_their_functionsijfwa.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/zonumixidasum.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/haagGgz/xezidizupasoximetijexid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fdf49e25f82d.pdfIn PDF document text
    • http://mediaverifiedbadge.com/hp_officejet_pro_8610_printer_failure_there_is_a_problem_with_the_printer_or_ink_systemxdxup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5324 bytes
SHA-256: 9d82eb10b64e34b307a325c2f7cffc9b26b81fdfb1d3526b26638589b51e4af1
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 11652 bytes
SHA-256: 76b8417f0fe758512d87ebe1b97b688bb3f25474ec922fdde2d57f75f004c14b

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