Malicious PDF — malware analysis report

Static analysis result for SHA-256 35990f3c5d51207b…

MALICIOUS

PDF

71.9 KB Created: 2020-12-03 20:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6463c7f084ed5c55a3bc8c14afbc66f3 SHA-1: ecdd749ff7d79748f0204534d242a4b344efd785 SHA-256: 35990f3c5d51207b8893bfd1fd5aece64c6b47e9e5397b6c661cef6fdd4d2af1
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to a 'house rental agreement template south africa', which is likely a pretext to trick the user into clicking the malicious link. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • 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://gettraff.ru/aws?utm_term=house+rental+agreement+template+south+africa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5faba36da28d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f96bbe0e69f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5fbd9f917cb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fa3595ab80a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fc059cfbb5b7.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/sepawi/44824846657.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fc0dc6b08845d0924aa5000/1606474860666/clay_county_moorhead_mn_warrant_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58b918e72e5fdbcee6af/1606375609859/iso_iec_27001.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d88a504bb4653ce18603/t/5fc89cdb970db930d9c53abf/1606982877586/bewatabaxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/whatsapp_status_video_songs_tamil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc1c07df81c9a2a0ce3235b/1606533246242/26656644877.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/28757474264.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/vegetarian_cannibal_movie_free.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5392 bytes
SHA-256: 213f20d68523105a4298b56015a963a439bb5c345b06cbea74bb8940143c2f75
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10572 bytes
SHA-256: d165bb38fe26ec26622ab8afa08d0fcbc1fa8c11a8733206f2e3bbe70c41dc46

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