Malicious PDF — malware analysis report

Static analysis result for SHA-256 244249235ab9f597…

MALICIOUS

PDF

75.9 KB Created: 2021-01-31 11:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be11e5f3f4dc1e7b504d7044b8915aca SHA-1: 6ea99af9f4e118bbcbab680e8b179451bc6cbe23 SHA-256: 244249235ab9f5973ddc919a15c2c6165d65424a7c29285c50cdbb164cbf850d
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to distribute malicious content. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://gettraff.ru/wb?keyword=defender%202%20mod%20apk%201.%204.%206`. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or malware distribution scheme.

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://gettraff.ru/wb?keyword=defender%202%20mod%20apk%201.%204.%206 In PDF document text
    • http://virnet77.ru/ielts_listening_test_2_accommodation_form_answersacwxb.pdfIn PDF document text
    • http://hydrofthol.space/tijodabusesozukhrkdz.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/4016636.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/6973a.pdfIn PDF document text
    • http://greyfruit.space/college_algebra_dugopolski_6th_editiont4av1.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/4304411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebibem.epizy.com/fosotovarewuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/tewenivosunemomop.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/cardboard_roman_helmet_template.pdfIn PDF document text
    • http://karatufi.epizy.com/davis_drug_guide_fifteenth_edition_apa_citation.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/55189109423.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/focus_group_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/56693280165.pdfIn PDF document text
    • http://jigosip.epizy.com/asine_remix_dj_bino.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/81866068825.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/24313665490.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/ppt_templates_free_for_education.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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 5500 bytes
SHA-256: 773cb6dbc8d31734cbe7164b264fdb922d397900a5c67fcc2e87821715781889
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10420 bytes
SHA-256: da870d5c040a42d09cb6d5057690e3ea1df6b884b6d6b9d16bbb9e42c73fe97f

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