Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0b429df4f3aa65…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 19:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70bb61da82e5b661dc13c7b7893b1951 SHA-1: c0e142155ea2afc92048eabf1d08e1fb6067bd1e SHA-256: 2a0b429df4f3aa650f45fb0ac58c75e7d96dfdb9c90c0ec46c8c3bc26912c1f9
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=cell+cycle+and+cancer+pdf PDF link annotation
    • http://kopavavabigi.66ghz.com/aatish_songs_pk_free.pdfIn PDF document text
    • http://donbetosstreettacos.com/dorefipudojaxilasopizawugs0q5l.pdfIn PDF document text
    • http://nicepics.xyz/roziref5yfr.pdfIn PDF document text
    • http://tryraisins.pro/saporifivdd754.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/jajefaxiridevavosupuv0v2s.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/bQxigic/ringworm_rash_treatment_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_602076e7ed322.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/gciazI8/minabiruzotowug.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5DXIhgj/lutugelujajukazavenowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_60244eefa13db.pdfIn PDF document text
    • http://lolkek.xyz/strategic_applications_of_named_reactions_in_organic_synthesisneje0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakafoboveje.rf.gd/how_do_i_reset_my_t_mobile_personal_cellspot.pdfIn PDF document text
    • http://jupuluna.epizy.com/bodyguard_film_video_songs.pdfIn PDF document text
    • http://zotawof.rf.gd/batodopafokepesitemuneju.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/tft_9._18_item_cheat_sheet.pdfIn PDF document text
    • http://fugazite.epizy.com/clothespin_donkey_craft_template.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_3b70f0d300fb4bf1b3a26b54ab1c0348.pdf?index=trueIn PDF document text
    • http://xewegifugeralot.rf.gd/best_online_photoshop_course_free.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_b55661886dc641558eac500e5f24397a.pdf?index=trueIn 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_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 4976 bytes
SHA-256: f97523825263cc4d91781f659bbafee377c34d186829dc89e4a3b5889b03d668
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10660 bytes
SHA-256: b5009a4b6a13f973f971746e0d123c49ab6f1c157c3b576047d9238a2bc6289a

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