Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4ec1c3b824b788…

MALICIOUS

PDF

116.7 KB Created: 2021-04-05 10:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63f0c499d5135652c78d3710acb766bc SHA-1: c76db28bedf8b58ab2c35842c1df006ed4ddf001 SHA-256: de4ec1c3b824b788c03d7f27b036a6edbef8ebd9ad7b29ebbe2d3e3b2cabe402
156 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 0.9994

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 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.
  • 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://jumiwimov.ru/aws?utm_term=miles+and+huberman+matrix+analysis PDF link annotation
    • http://lewijufe.sportsontheweb.net/24110364309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5feb83b035c08.pdfIn PDF document text
    • https://cdn.sqhk.co/penutizufib/ggdqKFL/acknowledgement_research_paper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_601a66cfd2140.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/lidotetekunexogevafuro.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/design_of_amplifiers_and_oscillators_by_the_s_parameter_method.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/hkiju6B/among_us_lock_screen_ios_14.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/nexaxolun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fcdbc197171c.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/jaiiegc/george_strait_songs_after_2000.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/pibUEhc/archery_contest_kingdom_come.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/jusuxosed.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/recertification_fmla_form.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_5652949a9f8e4654a07cf47f6bac102a.pdf?index=trueIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_5772c9aef1824302a341098beb39575c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/gmo_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/affliction_warlock_guide_wotlk.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/how_to_remove_a_jammed_ink_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/56453203776.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/25445219173.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_833f9323b38e4e7e9d5d33fe9e4f4887.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/best_quotes_from_pedagogy_of_the_oppressed.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_off00018d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7C 5380 bytes
SHA-256: 2d816c097d29b107939a7d000e0c6f2f0e238dd6b9c2a68d426afb41a445ff49
font_01_sfnt_off00019fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA9 11012 bytes
SHA-256: 8f44ce18c879840464a3d41a99c95f5b5f5fe3c9fb69cc66d66931790d8dd29a

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