Malicious PDF — malware analysis report

Static analysis result for SHA-256 db47ae98f2a62073…

MALICIOUS

PDF

77.7 KB Created: 2021-02-23 19:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 077d2ea6d4707feaaf8563b322b65f5d SHA-1: 2417c9ed0baa785b01acfb514c92e97626a69305 SHA-256: db47ae98f2a62073b3be8ec1315535fc5dd21cba770b8c2b9930703eae1f4b3e
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one that appears to be a redirector for a malicious PDF, and a heuristic firing for a 'download button' lure. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=english+speaking+course+online+in+india+free PDF link annotation
    • http://vosiwikaxipe.22web.org/40117780894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_601c9c0720f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404124/normal_5fc6d6a2d5633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417814/normal_60086f575b0f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370319/normal_5fef02d20590f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_5ff95ee3a56cd.pdfIn PDF document text
    • http://fidisop.22web.org/walmart_tv_black_friday_deals_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/hawhhXm/jipogixibelurorivomow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_602542ad34160.pdfIn PDF document text
    • http://rivimebowov.22web.org/52117563033.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/jarn2he/commander_cody_helmet_stl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5feb1e1d4e71d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolororufe.rf.gd/nccn_guidelines_colon_cancer_2019.pdfIn PDF document text
    • http://widafasamuj.epizy.com/74865820030.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/avatar_game_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/7519181095.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/52623563101.pdfIn PDF document text
    • http://jirudef.epizy.com/astronaut_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/epdm_rubber_sheet_manufacturers_india.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/domuvuzex.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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 5436 bytes
SHA-256: e181ab61d3520df075a270960b7eb7db9c57064ffa5dcd8b308f6f57775c1053
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10456 bytes
SHA-256: 32293f98d286d0d114292b6153d57a479dfcecad86cd1a969bd28abdcd81cd94

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