Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a2af87c46d840…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 08:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a444099bee5b43cc9783072cc0ee992b SHA-1: e930aff72f06fdb02a6b2af28fa0a03b0a691dc9 SHA-256: e50a2af87c46d84076569d4eddde9230e0afe58e5b70b3d556b737a1569ef513
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=badger+150+airbrush+instructions PDF link annotation
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/larimamijutaxad.pdfIn PDF document text
    • http://garirixis.22web.org/72685794814.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/5d0486de4.pdfIn PDF document text
    • http://pazanufedaf.22web.org/sijexebovijevesesa.pdfIn PDF document text
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/6fc2fd0ea352.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/ronivasedi.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/8047341.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/8e0e2d.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/fozoziloxedidegeja.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/ritoma/2794963486.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/sigosojepo.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/falling_slowly_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/71108942965.pdfIn PDF document text
    • http://gapedon.rf.gd/wisanabi.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/boot_animation_tool_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/con_cao_cao_nhc_thiu_nhi_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/jugajed.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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5676 bytes
SHA-256: e53dd84303e76dc9fd8bf7dbc02f3aa4a95304c37ff85f60cda37727ee4773f6
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 11524 bytes
SHA-256: e7a27b0e375642fa5dcfbf4fd69bdaa906cf4d70072e89ec23bd622884c92602

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