Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06df8b63e612f6e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-02 14:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d5e9569a2bc86f4019ab61be91f12afc SHA-1: 5a1ff947fdbecafe50ca47a01bbc382723a98af5 SHA-256: f06df8b63e612f6e146d173df4b95f081d19d713aad93fdb0e6d82d142fbbb51
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the ML detection suggest this file is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/123?utm_term=cannery+row+inn+monterey+california PDF link annotation
    • https://cdn.sqhk.co/nowonipewo/gaHoibG/zuterezumunodosekat.pdfIn PDF document text
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/bdbaae6e0f48.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/4436376.pdfIn PDF document text
    • http://theharaka.online/67353648230ebrad.pdfIn PDF document text
    • http://clyb-wylcan3.space/big_theta_notation_examplessgrg3.pdfIn PDF document text
    • http://vashobereg.com/fnaf_blender_modelgr9xp.pdfIn PDF document text
    • http://dimax.website/a_view_from_the_bridge_script28cg3.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/Mjcghij/drill_press_attachment_for_hand_drill_harbor_freight.pdfIn PDF document text
    • http://strahauto.website/fulepetobezat2vbvy.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/99779707475.pdfIn PDF document text
    • http://koolmaxt.online/13461596589h3cia.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/ucpghlC/57878489447.pdfIn PDF document text
    • http://copyrightprivacy.site/ayurveda_mcq_bookselj2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 4948 bytes
SHA-256: b7a29c7bea6cea2118e7e671386966245acb5b371cc06360c56b64722e2edaa8
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 10872 bytes
SHA-256: 79a6efdc314f232ed1806db565b781ffa099e44c365ac6d6ac1566007c8ded17

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