Malicious PDF — malware analysis report

Static analysis result for SHA-256 837e5fc20c92d78d…

MALICIOUS

PDF

69.2 KB Created: 2020-12-05 22:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 588b31d49f487a25b8f50979fb3db75f SHA-1: b83dc344a1436bac1f5811a5bd4653563dc4a269 SHA-256: 837e5fc20c92d78deb0369665abec2c94e73ab4696b6af16fb0c660df9392c3b
214 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Frenchton puppies for sale' which is likely a social engineering tactic to encourage users to click on embedded links. The primary link identified, 'https://ggtraff.ru/123?utm_term=frenchton+puppies+for+sale', is flagged as a malicious redirector. The file also contains a large number of external PDF links, suggesting it's part of a link farm, and has been detected by ClamAV as 'Pdf.Phishing.Trojan'.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=frenchton+puppies+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fa9b20f549c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5f97c94d3d8aa.pdfIn PDF document text
    • https://mikazeral.weebly.com/uploads/1/3/2/3/132303371/7796637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f9bc04dbc205.pdfIn PDF document text
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/dedd5d20e57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_5fb620431db67.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/tiroro_dawevufam_topow_bijoxilerugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfbaafa04221c71e6bcc9/1606286259417/vepejomosakuwixajur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfe517acac6192a86b821/1606286930224/carvel_pistachio_ice_cream_nutrition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37e48cd1e280355e49653/t/5fc9c637e4017829c16a6268/1607059000964/17985680672.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013a70a2757459bde56bb/t/5fc162eabc819f1cf40c513c/1606509292022/scale_factor_word_problems_calculator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6de278b9e860b7b1d6869/t/5fc814e5217b3604edcda1b3/1606948070414/dsi_recycling_schedule_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50bbc92c50b1a1e921daa/t/5fc8d16ab0f45b2a3d2ee47a/1606996332479/73320623667.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5060 bytes
SHA-256: d7dad35adfa3d769d3ebc4a0abd88941175676c899c5a885f4e20791f962548b
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 10448 bytes
SHA-256: a24a1da185bd46855c76ecfc0dfc8ad82a6007b001ee0df61804720cac9d410b

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