Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d38f9abf3265ba…

MALICIOUS

PDF

70.9 KB Created: 2021-02-24 02:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dfa5dd3d07de80688b190d3b4251dfaa SHA-1: 7e0f14c581c8278afb1d3d470eba619e4623cc11 SHA-256: 43d38f9abf3265ba9d5ff7b03ff6db25b864631bfd32a1b2d19535384ff94538
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=ryobi+3100+psi+pressure+washer+pump+oil'. This indicates the document's primary purpose is to lure the user to a malicious site. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs suggest a phishing or malware distribution attempt.

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://yafferge.ru/123?utm_term=ryobi+3100+psi+pressure+washer+pump+oil In PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/zuneji.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/1539555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_6015dc99a88a5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/fjgZgcX/mozekidivuxigarufaf.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/botifejasovil_desabotunupemep_jukopikopej_nikabodunu.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/9244402.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/wilodobebumesutazak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486363/normal_6008b6d90537d.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/Aigjhbb/tepawipaxabigididebuvebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_6023de296e280.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5fef89b016a4d.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/4054356.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/firudegix/fourth_grade_vocabulary_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/denegeguzosafujirukebil.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/29753874493.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/togudu.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/opodo_contact_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/nejusozibugapigawomanoma.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/bemelajawuz.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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 5756 bytes
SHA-256: 2fb9f7df1a728e451c8d0aab592b8ed88cd8e3ab75ddc0a8b4b7f3dec217ce60
font_01_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10252 bytes
SHA-256: 1217b156092786e9d25728bdfc739ba3dd3403985d1b5052ef68eff9efcc3d46

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