Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88d302cf6c550e7…

MALICIOUS

PDF

72.4 KB Created: 2021-02-25 04:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 658bc73f53f0308d5daae0d4e03dc7a8 SHA-1: 44661d3a3c98c7f417d12e6f746a2b28408a9cd3 SHA-256: b88d302cf6c550e7a7fb68c81c8ca14385acc015e6d4107b10263a3fe1e46ab5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector pointing to a lure related to a 'Realtek hd audio manager update'. The heuristic firings indicate the PDF links to known malicious infrastructure and is classified as a phishing trojan by ClamAV. The document body, though heavily obfuscated, contains text fragments that align with the lure of a software update, suggesting a phishing or malware distribution attempt.

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
  • 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://yafferge.ru/strik?utm_term=realtek+hd+audio+manager+update+windows+10 In PDF document text
    • http://namedaun.fun/35092960497en8hw.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/30617267196.pdfIn PDF document text
    • http://dijawobal.iblogger.org/car_theory_test_questions_and_answers_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_600a0878d2758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fe1164bda2ef.pdfIn PDF document text
    • http://a1metromovers.com/edhelper_answer_key_social_studiessphq9.pdfIn PDF document text
    • http://uanews.website/how_to_fix_a_washing_machine_agitatortio14.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/46527ad1eb8.pdfIn PDF document text
    • http://good-production20.site/cryptogram_puzzle_post_answersznds6.pdfIn PDF document text
    • http://vojutivuzijan.22web.org/cuanto_mide_un_pie_cubico_en_cm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://febuzoremasovev.epizy.com/the_hundred_year_marathon_summary.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/dark_heresy_2e_character_sheet.pdfIn PDF document text
    • http://puwixatokido.epizy.com/point_slope_form_slope_intercept_form_worksheet.pdfIn PDF document text
    • http://nipalarinab.epizy.com/sajuga.pdfIn PDF document text
    • http://malebujezasipip.rf.gd/jokufiwuzinibaxonasone.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/battlefield_bad_company_2_android_mob_org.pdfIn PDF document text
    • http://figabubif.rf.gd/vifugiwewelefami.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 5728 bytes
SHA-256: 01cc74c0177537e2e606db4908110cee2c6a33e3a0bd11f3e0b599c7c5551261
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10576 bytes
SHA-256: 18ef67632c7ba13658ccc0bb4e87019edff91715a22c29f79df3de0b9d9043cc

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