Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d6164ef658cbfc…

MALICIOUS

PDF

81.4 KB Created: 2021-01-28 12:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fb0414c80b6c43ed87db35d23473c781 SHA-1: 463f8cb8bb6f8f594400393e03130748adbf302c SHA-256: c7d6164ef658cbfc0caac3467856aa71e81a6a1d28938c3e9b402a76c0dba081
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/aws?utm_term=justice+league+animated+movies+dual+audio In PDF document text
    • http://xagimovuroj.22web.org/arithmetic_and_geometric_sequences_worksheet_answer_key.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/98beba623c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixugikel.rf.gd/davubulifow.pdfIn PDF document text
    • http://voboxixet.rf.gd/castlestorm_trophy_guide_ps_vita.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/14305447473.pdfIn PDF document text
    • http://tosuniwenalob.epizy.com/43099493738.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/circle_of_fifths_app_android.pdfIn PDF document text
    • http://puzujudu.rf.gd/takejurofusukir.pdfIn PDF document text
    • http://lalejifidesuwo.rf.gd/3d_hd_wallpapers_1080p_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/decorar_la_sala_manualidades.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/australia_visa_form_1419.pdfIn PDF document text
    • http://wejivitekep.epizy.com/25090244373.pdfIn PDF document text
    • http://lugirike.epizy.com/22568413373.pdfIn PDF document text
    • http://vutagefen.epizy.com/creepy_happy_birthday_piano_sheet_music.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/sharing_report_folder_salesforce.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/shared_task_list_app_android.pdfIn PDF document text
    • http://razogop.epizy.com/jasper_report_format_number.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/pain_agitation_delirium_guidelines_2017.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/lunosiduxuriwatefowu.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/38122964349.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_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 5212 bytes
SHA-256: 0397f203b6545aa588ae21ee5f532657f11cfa13e14310a1b8be71d9d7d7bddd
font_01_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 12384 bytes
SHA-256: 1753dc03b334b2fe2550eff181537210fca2959688cc45c5cbd63c42a6fbb70c

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