Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd496f8a05ab369…

MALICIOUS

PDF

100.0 KB Created: 2021-02-13 08:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9480ed67b5eb0139db116f1f9fe746b0 SHA-1: 945b3f1f75fbd46ca32cc740c5f47aca425ca30e SHA-256: cbd496f8a05ab3694c1e1580eae36f836f61f5d4a7dbc43a0f59132115d17c26
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking PDF files hosted on free services, forming a link farm. One of the primary external URIs, https://baarspo.ru/123?utm_term=boxing+manual+pdf, suggests a lure to disguise malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=boxing+manual+pdf PDF link annotation
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/bbeaf239725.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/180838a4a0e.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/hjqqgXz/palopazuzegures.pdfIn PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/wopopesalulaxaxo.pdfIn PDF document text
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/1184643.pdfIn PDF document text
    • http://nemurirewokow.iblogger.org/misty_jazz_piano_solo_sheet_music.pdfIn PDF document text
    • http://loxigedu.iblogger.org/79106029525.pdfIn PDF document text
    • http://mepowixodudod.22web.org/human_centipede_2009_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/jbheGfe/lta_m_e_checklist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasalesex.epizy.com/29577183289.pdfIn PDF document text
    • http://sugizujesel.epizy.com/sodebebo.pdfIn PDF document text
    • http://gugujis.epizy.com/autocad_2015_lt_link.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/37510475932.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/all_about_me_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/14962228569.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/sensation_and_perception_ap_psychology_study_guide.pdfIn PDF document text
    • http://fakefujakarip.rf.gd/bazedupabifofure.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/23711144867.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/87029751931.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_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 5204 bytes
SHA-256: 5cae599ffd59aee9b62ad56c96cd905eb371e2950f36fdba6ecb8d8726701f71
font_01_sfnt_off00015d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D76 10984 bytes
SHA-256: 8a1965d113eeaf1574bb7132d8e7f674b882b201dc686bd84922ae2e1b3cbdbb

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