Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19a67c1ddf6c9ce…

MALICIOUS

PDF

78.7 KB Created: 2021-03-10 23:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c87096e82d09f4671672d8c06ee0856a SHA-1: d81443c5d6a4b6a2a909befc80fc8828506fef71 SHA-256: d19a67c1ddf6c9ceb46cf8417259ba01e80b2a83c656fb4c875a7ae8692eb0ff
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to external resources.

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
  • 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://maypoin.ru/wix?keyword=scientific+inquiry+worksheet+answers+pearson PDF link annotation
    • http://woxuruko.medianewsonline.com/neduve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_6029c6379e9e2.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/geography_of_ancient_greece_map_skills_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_603c4afd773b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_6045fc15f1184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fca6e42246b8.pdfIn PDF document text
    • http://zavodtriumf.com/40726372961ulm6j.pdfIn PDF document text
    • http://nagajavanof.22web.org/android_studio_modal_dialog.pdfIn PDF document text
    • http://twirlini.com/ecuacion_balanceada_del_acido_nitricogq0ic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5fe3214b2e4d1.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
    • http://piwakolipa.rf.gd/81781927119.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/98765441364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca15dc6-d3fe-444a-b07a-df344f9dd6cf/christian_graphic_novels_for_tweens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ed6c48-3019-418d-9696-c910a09b2d32/84949349133.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/telugu_action_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/gapakafanujunozimibogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/cafeland_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710b386d-9dd8-48b3-b7ed-0bd98ac4083c/traductor_de_ingles_espaol_gratis_sin_internet.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5440 bytes
SHA-256: a520e9ae915dfb69fd87a824663327901b8b80695077505ffa320dda32078129
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10508 bytes
SHA-256: 3c9f8a96e78d10592881801794dad65ed58becdb70cd7aa41b5c7da98c48953e
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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