Malicious PDF — malware analysis report

Static analysis result for SHA-256 90233d6990e86748…

MALICIOUS

PDF

75.6 KB Created: 2021-03-05 21:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 1b495f3f04edaf8900fa56e7a16c5b2c SHA-1: 936490b91a4ba4a7b17aaf6f62defc356c74589a SHA-256: 90233d6990e867480a0d98ecebda2e237df63fcce19dfa5b30755965bd137c65
126 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. It contains multiple external URIs, including one pointing to 'ponafet.ru', suggesting an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting, a common tactic for phishing and malware distribution.

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
  • 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.
  • 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://ponafet.ru/wix?keyword=cells+and+tissues+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444655/normal_600ae3e35d65f.pdfIn PDF document text
    • http://honey-love.ru/avengers_civil_war_movie_in_tamilqtdra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fcea48139139.pdfIn PDF document text
    • http://1fps.ru/88896175306817pr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6015b24d3634d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445736/normal_5ff75d70d6d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_603b3479011ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_60305c7c548cc.pdfIn PDF document text
    • http://mesretly.xyz/1423453063syfty.pdfIn PDF document text
    • http://domavera.ru/24177189781thfnh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_60320e73ab10c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_603b7644d3e60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_a3a634645a2841bcb186d1235a80f975.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2bbfe86-6646-4770-bc1f-c448283c769c/how_to_replace_analog_sticks_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecad808-e68a-4bb7-9605-659d62f90b3c/gaggia_brera_fix.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_174e0e7b008a4d40af7c24331f323e1d.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_932ab6aa272242b38134f29b3041c603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gokonuwufojuzamatitijujog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b875eeb-836e-4f33-823e-46bd9030a92b/lopewofuso.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/wulobojage.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/fotipimej.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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 4972 bytes
SHA-256: 194c0b554aecfb6a6d451cd639f8c8a5b09d4e056ee406ebdefe4b3202416039
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10396 bytes
SHA-256: acffb7df04274ba8f3cd1ee58d5aad7d1aeb8145e84003e75aaedaf931cff3e4

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