Malicious PDF — malware analysis report

Static analysis result for SHA-256 407abe9dfdd4a7c8…

MALICIOUS

PDF

77.4 KB Created: 2021-02-22 09:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2577605c98afb899dc8cfbd0a772eab9 SHA-1: 9054bff3b5d2ccaab99e5b37a2ba89e2a14e2d75 SHA-256: 407abe9dfdd4a7c8849708d147d8bad98881c544d5256bba03e523176d1bc23c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though heavily obfuscated, contains text related to trigonometry, which is likely used as a lure to disguise the malicious intent of directing users to the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=sin+cos+tan+180+derajat In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5fc578226c682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389830/normal_6005ea18cbad0.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/h54mibq/87785600417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fcbb66cd7e60.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/jdPygdl/warhammer_40k_start_collecting_primaris_space_wolves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_6014dad110430.pdfIn PDF document text
    • http://tubiwupijekowam.22web.org/certificate_of_commencement_of_business_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143dee76894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5feffb63739fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423750/normal_60033ac9bba1b.pdfIn PDF document text
    • http://golivexi.22web.org/sherlock_holmes_subtitles_season_3.pdfIn PDF document text
    • http://wimosam.22web.org/75435295713.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/bitajemisajoz/56461652080.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/fresh_menu_app.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/baldi_s_basics_free_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/jasoda_sarkar_baul_gaan_hd_video.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/gradle_test_report_customization.pdfIn PDF document text
    • http://zoletafexogixa.epizy.com/besunaxewojedusunibuk.pdfIn PDF document text
    • http://jasigobup.epizy.com/baby_shower_invitation_card_word_template.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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 5468 bytes
SHA-256: 748360fae5cc9e306080e87db0c2bb5e26a021ebf51903de7e81276b3963c1a1
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 11448 bytes
SHA-256: a8504f2d1d6daf3281c6a0cf749823c142efbdb66c08df5676e8c26200f2ebc7

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