Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d8b2f796d30a8a…

MALICIOUS

PDF

133.6 KB Created: 2021-01-31 06:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50ea7d00e82b8a885ba8556fbc6fb219 SHA-1: e5618a7d8fabfcfde5c7a413356a62663dc6f89d SHA-256: a5d8b2f796d30a8ad17803fbda6a946da8c1df9fa431addfbf45126492cdaf05
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/wb?keyword=pokemon%20tv%20series%20season%201'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests it could be used to deliver further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/wb?keyword=pokemon%20tv%20series%20season%201 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fd9cc979ec61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fe4a403f25f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff1dcea4a23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fd88f311c511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6013438669f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6011bb917c581.pdfIn PDF document text
    • http://fuckfrsky.com/24_hole_chromatic_harmonica_lessons8t7kt.pdfIn PDF document text
    • https://cdn.sqhk.co/paxabuxutujo/ibjjTgx/90313981306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5ff80994b231c.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/jgjdmHw/80980314923.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/hjZghUu/vamizofa.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/jjifoDr/wodesazopokifix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fcbfee0c632f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/suddenly_seymour_sheet_music_free.pdfIn PDF document text
    • http://tonataf.epizy.com/rectilinear_biphasic_waveform_defibrillation.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/iphone_and_android_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/application_form_for_medical_colleges_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/26000228039.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C19 30680 bytes
SHA-256: a2a48f83ae54570d6de98ff9cdb0ac36f3cfdd4d2c3b77fa1e05e9f18a375146
font_01_sfnt_off0001ad27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD27 4764 bytes
SHA-256: a488bdfb1d951df6dfb8902dcfad1e0f03a70295a9cddcd45a32067da9ddfe42
font_02_sfnt_off0001bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD3B 11828 bytes
SHA-256: b1ac988c23b76d37378cd253b64ee6e8e9d37b3ceeca6075c013b7507cb391c2
font_03_sfnt_off0001e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E444 16268 bytes
SHA-256: ffec52081f74c6b20613a41dca169113a366164a25ee4b46817ecd29964e04c6
font_04_sfnt_off0001f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9E4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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