Malicious PDF — malware analysis report

Static analysis result for SHA-256 b809872b865269aa…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 11:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0623bfa4dbb1105eb064d2e0a66df65e SHA-1: 31d45b56f235b2aca6159e4dd29b0a926b231d66 SHA-256: b809872b865269aa28b234b62c90bfc312877d6f0e12d225f21d1b669ba07205
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate search results for academic papers, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=brukner+and+khan+5th+edition+pdf+free+download PDF link annotation
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/7a1697e640ae29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_60167c7f662a8.pdfIn PDF document text
    • http://begdas.space/omnifilter_u25_manualovqp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_60162bffceb5c.pdfIn PDF document text
    • http://steblin.pro/71016060025a043r.pdfIn PDF document text
    • http://salet.store/microsoft_word_document_download_for_windows_10ra27q.pdfIn PDF document text
    • http://trokot-roznica.xyz/narapisixkxhdw.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/juviwexi_bavozajazuzekaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fe8095133d68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e7ad20822e504f35abc91c748d092e38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/balesizesiguxudu.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/66826345537.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/fiwopoziseb.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/10724497698.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/snoqualmie_pass_weather_report_noaa.pdfIn PDF document text
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_b083e92a21224332a6ddc63a5992964a.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_2438c9c8ccfc412f807c5206ea41b34d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/54739758780.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/tetep.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/wondershare_mobile_transfer.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_f48bef24b30b410193c3b6f975f25edb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/cap_full_form_military.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/kamejudibuzeki.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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5280 bytes
SHA-256: 216a05da24cc22abd380008d9a96fe4ffbd60a0ebd565ee8c66dcadb0e70662c
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 11588 bytes
SHA-256: 88c99c754298b524c861ef5ea68fe059fbebae04b84c36fb13d9dec20e2032fe

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