Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5276969686818f…

MALICIOUS

PDF

66.6 KB Created: 2021-03-13 19:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 10e4463ac10a8e182571014a03c7ff7a SHA-1: 35321ed3ec851dd1c5670d46988f8b2d4750eaa4 SHA-256: cc5276969686818f010acef86de905f3973078947348ebd86247deb5f32e3ba9
104 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs and a heuristic firing for a visual download button, suggesting a phishing or social engineering lure. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of suspicious URLs and the nature of the heuristics point towards an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=facebook+page+worksheet PDF link annotation
    • http://lebuvowune.getenjoyment.net/whats_the_fastest_way_to_learn_korean.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/mutirape.pdfIn PDF document text
    • http://peuly.xyz/fixalazufe9jqdq.pdfIn PDF document text
    • http://aycotoro7.xyz/how_to_buy_a_home_for_beginners08rxo.pdfIn PDF document text
    • http://clientbluebadge.com/292469416690vgih.pdfIn PDF document text
    • http://4338bacchus.com/jorge_luis_borges_ficciones_englishe1fuy.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/digital_asset_management_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_6d2893dc127e4d0896f19f7322409f8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/jaduxanudifogawuropo.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_99acb2cb986749e99b685e6c838b475d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/lufokiginimanog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf357aab-a207-4a33-bbae-6f99a99d3952/52865093954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e81a6d-7058-492d-b924-4a791e344509/death_note_season_2_manga_release_date.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/hp_officejet_8600_printer_price.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/vipalujaxubojevusek.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_0b540805fe00491fa9fcca40475a05a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/aiou_challan_form_continue.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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 5416 bytes
SHA-256: afaa5bed3590484c2aa444bd297e6a2f7207b49374872b1dc2a58a47bf6dd326
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10244 bytes
SHA-256: ceb1c2554bbc3d86149da9ccb924469cff402cf3c814d4d69a07dbfde6a9e78b

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