Malicious PDF — malware analysis report

Static analysis result for SHA-256 10afa6eb5054aa12…

MALICIOUS

PDF

79.6 KB Created: 2021-05-23 15:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8216a12887898e4158515e4bec44c740 SHA-1: 63a4ccd29f931be8abaa7d21186c76d3cb958d16 SHA-256: 10afa6eb5054aa127589ed7e24e3c6cae8d461e0a8be837372a71506127e3d42
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. One of the primary URLs, https://jumiwimov.ru/strik, is directly associated with this activity. ClamAV also detected this file as Pdf.Phishing.Trojan, indicating a malicious intent, likely related to phishing or distributing further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://jumiwimov.ru/strik?utm_term=subject+verb+object+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605fe6751bc9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fecd43cdd481.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/3521862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_603d86dd360a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_6069eb0d26c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fd76bdad4029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fd0a760c4653.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/rejoxa.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/7081073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fe618bb7e00b.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/nunemowizuzow-jizeroweb-suzixili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_602b862abeea9.pdfIn PDF document text
    • https://dumugeve.weebly.com/uploads/1/3/5/3/135318044/3191909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/70496444540.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/application_of_calculus_in_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/how_do_you_build_a_house_in_sims_4_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/how_to_make_a_timeline_in_excel_office_365.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/77441761936.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/95003425192.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/tuvibivitew.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/tosojerovanukodulis.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/manual_car_in_gear_but_not_moving.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/baarish_lete_aana_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/jesokujozat.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/60140501846.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5264 bytes
SHA-256: 7b257f51ad05c1507fbf66883502f534a4b18cc65d27f655d84d8e33f0a68e60
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 11140 bytes
SHA-256: 088c8393589078357d3f037b9114ae73c8f8b08a8190451b7f78e932cfd50014
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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