Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f274988bf0b0f9…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 04:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533710047b6625a5271f95d5161fd7e6 SHA-1: 87ecec987b4cd1c4ac8c30995fea74ad902acf28 SHA-256: b2f274988bf0b0f90072e07529aa6bbbb95781526a80603899ed2747636372b2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://priz24.site/79104735931fe0cf.pdf
    • https://cdn.sqhk.co/libewepigux/bk2IgcQ/vasud.pdf
    • https://cdn.sqhk.co/kerinetivama/INhgqgh/83144186882.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_5fe8ff2b8659d.pdf
    • https://cdn-cms.f-static.net/uploads/4495402/normal_6056cf1343fe9.pdf
    • https://cdn.sqhk.co/rorajakura/hd1oviN/wedding_salon_game_free_download_full_version.pdf
    • http://grusha.space/my_btc_wallet_12hbxz7mzn3lgt3sjcss6ys4tvefpbwcptz2wwq.pdf
    • https://cdn.sqhk.co/sirijunubi/giyanme/best_notepad_app_free.pdf
    • http://wadupobem.iblogger.org/projeto_piscicultura.pdf
    • https://cdn-cms.f-static.net/uploads/4426087/normal_60303bb8b330b.pdf
    • https://cdn.sqhk.co/fevivesuxofo/UQeeQUU/97534526410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=optiplex%205070%20release%20date
    • http://bixuxopot.epizy.com/free_flower_paper_border_template.pdf
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_a4dc320af39c4e0e96409655f59ef051.pdf?index=true
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_df54557e4bf243868473bc007fc6f0f0.pdf?index=true
    • https://s3.amazonaws.com/nevowimo/gubekefelosuzomuzakitom.pdf
    • https://s3.amazonaws.com/tezofuretejom/architectural_drafting_and_design_free.pdf
    • https://s3.amazonaws.com/gumagabu/division_facts_worksheets_for_grade_6.pdf
    • http://lulasiwafa.rf.gd/nupobezekuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin
60491a3f6bf85bfa0c576233424c5d9e84cdc44d285e0555c2bd211746e877b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 5396 bytes
font_01_sfnt_off00010060.bin
4039d9220ffc44f341a6a1b1a96e03f7613b8dea6315c67ae2c6782e00c295d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 11192 bytes

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