Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58acef5d422772b…

MALICIOUS

PDF

45.5 KB Created: 2020-10-08 04:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3c0bd2abd13e7190e92246b9b73af28 SHA-1: 64127de42cdac5b4ad9910d048d42ba38db7391b SHA-256: f58acef5d422772bff546a64b0329afb8b0bad24207a0fcc0c0bf0a6b2cdbd5f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and are flagged as part of a link farm or redirector. The document body text, though partially corrupted, includes a URL that matches one of the identified malicious links, suggesting an attempt to disguise malicious content as a job circular. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=ansar+battalion+job+circular+2018+pdf In PDF document text
    • http://bolen.lucylordauthor.com/uploads/1/3/0/7/130739291/tepezojalofija-lepawebul-vekuninimoji-devuderemom.pdfIn PDF document text
    • http://files.nighthawkgolfcenter.com/uploads/1/3/0/7/130775350/muritizok_nidaxoxav.pdfIn PDF document text
    • http://files.pamelagossett.com/uploads/1/3/0/8/130813325/givexetijuveputuwero.pdfIn PDF document text
    • http://files.colligangolf.com/uploads/1/3/0/7/130775108/8450696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/vectrax_bandsaw_parts_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4922/1785/files/nozuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9937/6808/files/pilot_juice_pens_0.5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/samurai_x_pill_website.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/4031/9899/files/hillary_scott_thy_will_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2372/9318/files/3_handle_tub_and_shower_faucet_brass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3591/3123/files/23075658407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2568/0542/files/37053593143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba62baa-08cc-4453-905a-b503e3a6f555/19840600852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9abf09-402a-4f62-b531-a16d5cb5daa9/sozivitaniguwopevatet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC7 5876 bytes
SHA-256: 3430c72965e56d050fed29aad05f5d8c086a552b5a98d084a352d155051d1d36
font_01_sfnt_off000070da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10112 bytes
SHA-256: 41d874c58a7c45be1f157e8a25601e16f6de66046ce4be62536b2b6819b66d28
font_02_sfnt_off000093af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93AF 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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