Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65910796fc15a4a…

MALICIOUS

PDF

73.1 KB Created: 2021-02-06 10:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b62b1dfe792b88e0d6634c98ee69b746 SHA-1: 16772324cfd6dfd383f431850300291d2394a5d8 SHA-256: e65910796fc15a4ae9a9fc82c2c719f238809b65ee8d595cad936107f6c4cf3f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or SEO manipulation.

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://leonvi.ru/123?utm_term=the+bottoming+book+pdf PDF link annotation
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/9965371.pdfIn PDF document text
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/zaboxi.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/7750626.pdfIn PDF document text
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/1215763.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/4fb44a522d7.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/rafurowokoloke.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/zejowada_savobafonewekej_wasovawimi.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/3155885.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/fumiposamisur/buxatavafowapuge.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/baraye_dil_e_dukhtar_status.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/deltarune_chapter_2_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/sky_full_of_stars_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/sheets_on_sale_at_the_bay.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/93575293155.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/flight_time_calculator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/gabriel_s_oboe_guitar_sheet_music_free.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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 5092 bytes
SHA-256: b14d741f5409f450209189dad2271b045f32e9e1f5b5a6504d744bb11bb70f45
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10928 bytes
SHA-256: 7c10ed38cc111343b2f5a8e3495eb1ee441d192fc069281167ebb9e1f4078677

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