Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a842a622bd3655…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 16:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 76202f26728d90f3eea49bec17abd47d SHA-1: 31abf2d24d610bca123cc684528e5048b87c5d5e SHA-256: b6a842a622bd36551d87ee5b41bbebb161e173d41020246f489585b681a4d596
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to the PDF's creation, suggesting it's a container for the malicious links rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=voyages+in+world+history+third+edition In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5ff136d1d36d9.pdfIn PDF document text
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/kusux.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/cjgKJ6X/domino_pizza_deals_uk.pdfIn PDF document text
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/4270615.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/8DAv2Nu/choices_of_the_oregon_trail_mod_apk.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/2740679.pdfIn PDF document text
    • http://xivitej.66ghz.com/english_vocabulary_in_use_advanced_book_with_answers_and_enhanced_ebook_third_edition.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/91eb84.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/ahigfe0/65020821534.pdfIn PDF document text
    • http://firavowinoza.iblogger.org/rimatazufikufolebigatima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemubozureta.epizy.com/60418854254.pdfIn PDF document text
    • http://fakeduzit.rf.gd/chitakli_ghorpad_song.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/rivorujujigasematawi.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/pdf_mi_primera_comunion_catecismo_del_nio.pdfIn PDF document text
    • http://lusuzajemofim.rf.gd/firefox_version_50_for_windows.pdfIn PDF document text
    • http://teditobu.rf.gd/xesometumuxapenuji.pdfIn PDF document text
    • http://fobifuv.epizy.com/civic_2012_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/circuit_court_case_information_newport_news.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/22564555018.pdfIn PDF document text
    • http://dafevuzadolax.epizy.com/besharam_movie_song.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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 5244 bytes
SHA-256: 774141d1431604211495769f6d397b4dd39e95f26cccb2b2d5432e7eb1f887f9
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 12912 bytes
SHA-256: ffce75a15116e98fc303af38b94909339d71369fc5641bfd6cc36521e37e3912

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