Malicious PDF — malware analysis report

Static analysis result for SHA-256 231cefbcc956c9cf…

MALICIOUS

PDF

71.0 KB Created: 2021-01-31 02:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d54f5bc12236754231f3d8df16a8858 SHA-1: 0db14719518c67ef8faa50677e18c029404fabf4 SHA-256: 231cefbcc956c9cfd46b90c8408233f337f53322145fbdc3d246f78f91b0dccb
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, yafferge.ru, which is presented as a download for VLC player. This indicates a phishing or social engineering attempt to trick the user into downloading malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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/aws?utm_term=vlc+player+for+pc In PDF document text
    • http://m-laskin.ru/first_words_book_the_works0n8w0.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/gQPcctJ/mountaineering_gear_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/RZig7hd/notes_payable_trade_vs_accounts_payable.pdfIn PDF document text
    • http://dompodklyuch.com/gekegimimafelam3by2e.pdfIn PDF document text
    • http://prizinsta.online/98935695784vesy5.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/cjdji5I/ant_colony_optimization_code.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/xiiiigj/41754322788.pdfIn PDF document text
    • http://quinzsy-studio.design/sms_keyboard_apk_download_201821b8i.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/rirusozo/jaxodafuwikexugozatuto.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/zabodarolomadubufe.pdfIn PDF document text
    • http://likijanima.epizy.com/continuous_catalytic_reforming_unit.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/android_studio_full_version_offline_installer.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/11887851564.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/math_worksheets_7th_grade_free_printables.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/tudamubetam.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/locked_away_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/xafexumeraxosanixuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/fadezobelobuwifakogofu.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 4896 bytes
SHA-256: b7436127dba6fc8739c0025c5efd9ef2f3b6704fc7924fbcbb06d47a523b16c4
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10376 bytes
SHA-256: 4a53487f234b6f966d69c02f1c97e1376e9b787ef51374da6ad3cb4fc5fe83c9

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