Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cc687a6b398bc7…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 06:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 500fdd3f69607186c13a025d9eb43447 SHA-1: 9cc95b25f47e1f73d197a86fcafb3246b04aa2f2 SHA-256: 43cc687a6b398bc7e9a1921e71f85f5a95db53350de29f04efe963cf595cc52f
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 0.9995

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://seumenha.ru/strik?utm_term=brother+intellifax+4100e+change+drum+soon+message PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5fee2434b3389.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/ielts_speaking_mock_test.pdfIn PDF document text
    • http://nimolebefiv.22web.org/61226042667.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/biogas_production_from_agricultural_waste.pdfIn PDF document text
    • http://zatuludarapix.iblogger.org/bopinizo.pdfIn PDF document text
    • http://disozire.mygamesonline.org/download_bhagavad_gita_in_sanskrit_with_english_translation.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/16653042307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fc6c18d99d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_6026b35826d9a.pdfIn PDF document text
    • http://latirogemiwufiz.22web.org/xurugusivuvalopis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_2caf20d99099434e9bddda4ecb9a1feb.pdf?index=trueIn PDF document text
    • http://mafujerodise.epizy.com/8038806531.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/wordly_wise_book_6_lesson_14.pdfIn PDF document text
    • http://lefarobi.rf.gd/wezojivuzukav.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/binary_addition_subtraction_multiplication_division.pdfIn PDF document text
    • http://welerepo.rf.gd/62732829210.pdfIn PDF document text
    • http://kojodidekojamu.rf.gd/avery_label_5163_template_indesign.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_13e69989cb9a4caa9b957dbc2e6ff0e3.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_a371b7fa00ca4da19e9089ba60024c78.pdf?index=trueIn PDF document text
    • http://xepolowamozuxan.rf.gd/74259223602.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/19526167168.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/buku_akuntansi_pemerintahan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 5836 bytes
SHA-256: 218f58b95894b6c990fcdfb3d76d0b99dcfb308d89ebedda7687d2d25417a76f
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10332 bytes
SHA-256: b6637c3a4addecec443aa6539355857b082bac93ced6b951cec281893897d7af
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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