Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eccf154c964aaa0…

MALICIOUS

PDF

69.9 KB Created: 2021-02-18 19:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f7a0a17af586490eaec994cda964a687 SHA-1: 5905462f070995b91ee2ae786662904c441f2341 SHA-256: 8eccf154c964aaa07cbb85d82454951d61afcee4987d58722e5828e973c3c5cc
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. Several of these links point to potentially malicious domains, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection further support the malicious nature of the file. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristics suggest an attempt to redirect users to malicious content.

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://jacksth.ru/wix?keyword=betty+crocker+cookbook+1969+pdf PDF link annotation
    • http://pay-order.info/ftdi_drivers_installation_guide_for_windows_10ikcig.pdfIn PDF document text
    • http://table-wait.com/54614369563tla6l.pdfIn PDF document text
    • http://7lessons.fun/516253458429xq0g.pdfIn PDF document text
    • http://cheapestshop.xyz/jajibenarorsvg22.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/my_talking_tom_pool_hack_mod_apkhhqwj.pdfIn PDF document text
    • http://test123test.xyz/livre_chevalier_guide_du_dessinateur_industrielri7ps.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/fajesakuka.pdfIn PDF document text
    • http://skidki-day.site/asfixia_perinatal_gpcwiefs.pdfIn PDF document text
    • http://getyourscore.info/buzifuxisagoq4j6d.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/655991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/pibiruparuwalomemi.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/lenovo_ideapad_700_bios.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/zizenedajeduwopolul.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/plant_and_animal_cells_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/aashiqui_2_movie_song_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/cesare_bonetti_magnetic_level_gauge.pdfIn PDF document text
    • http://tewederukafolez.rf.gd/xerasetedanov.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/lol_ap_kai_sa_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/printable_template_for_baby_shower_invitation.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 5444 bytes
SHA-256: a3265c35ab565120c6c5ce2ae08f24609f62bcee5d697bf9914231aa5bc8e5af
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10452 bytes
SHA-256: 77f10cc5b2592123728667d562eacabdddcc8cc80502d1c09779d299fa3bfc4b

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