Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a7869d58655874…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: eff46859760870f2cf90268de00a573c SHA-1: 26406f9ac901c684210974d707343863ac8b06d3 SHA-256: f3a7869d586558748680407d076318b3e70846b811ebc067746d1a1b5a6d089f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'snow whitening before and after', likely a pretext to disguise the malicious intent of directing users to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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 https://resalured.ru/strik?utm_term=snow+whitening+before+and+after PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369911/normal_60238a4a24e7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_5fcd62cdacc9d.pdfIn PDF document text
    • http://rent-nout.site/ray_dalio_principles_audiobook_mp3ohggm.pdfIn PDF document text
    • http://it50disconto.pro/fisher_and_paykel_dryer_spare_parts_sydneygvf6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_600d336228025.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/best_app_for_ipad_mini.pdfIn PDF document text
    • http://dirtygirl.fun/dell_latitude_d830_laptop_graphics_cardlulfp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fcc21c561c4c.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/rak_ceramic_tiles_catalogue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fed3dfa0dad8.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/aws_certified_solutions_architect_2020_practice_questions.pdfIn PDF document text
    • http://healsmall.space/2015_chevrolet_suburban_ltz_owners_manualp8to2.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/zamuriza/formato_de_carta_responsiva_auto.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/pukofifeni.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/66968220900.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/what_are_the_4_major_goals_of_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/deginoxojafomijan.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/foreziminiwewopila.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/bisirizowudajukuzanobedof.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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 5296 bytes
SHA-256: a8219cd03c4d2e50a0995757a08284878afcc774690cb9d56e88d30a346ae45e
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 11480 bytes
SHA-256: 386c650686798f924a7f2dd93a4a26b8213e31cf6156d32b4113b632c1a0f8e1

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