Malicious PDF — malware analysis report

Static analysis result for SHA-256 06765442ea9dcd5d…

MALICIOUS

PDF

88.7 KB Created: 2021-03-03 21:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9fbc23cb2d724ebc85a604b4eae3871f SHA-1: e51efd23ece7a7ab2079abd714e1492b4f43d2a7 SHA-256: 06765442ea9dcd5dd958e60cc4973db40fd14166aa9ea0f46d6947449a60f3a3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting an SEO link farm or content manipulation tactic. One of the primary URLs, https://mezovuduw.ru/strik, is likely a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the PDF structure itself is indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=power+wheels+dune+racer+battery+connector PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ffdf08ee1e0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fe207953257d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_601efb1421228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff0e56a4bfeb.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/lugijusomam.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/fiahbjQ/wibubalema.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/t9QjbHt/superhero_images_hd_download.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/3899935.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/jotinud_wojezolada_rukuwozega_vufexirina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462073/normal_5ffe1394c1257.pdfIn PDF document text
    • http://ewop.space/nibojevirrna.pdfIn PDF document text
    • http://nakrutkavk.site/tibazej5gct.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/gexukafosekosaruje.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/Qjcgeii/infectonator_survivors_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedalavupu.epizy.com/solving_equations_worksheet.pdfIn PDF document text
    • http://pemukusa.epizy.com/walmart_grocery_app_promo_code.pdfIn PDF document text
    • http://zagopemolal.rf.gd/how_to_win_logo_design_contest.pdfIn PDF document text
    • http://ratazudawi.epizy.com/how_do_i_contact_my_child_support_caseworker.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 2880 bytes
SHA-256: b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 5364 bytes
SHA-256: 766d1d20df54652c40fe91b9a692120427f3543d9b843068f008abe43eba7d03
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 11536 bytes
SHA-256: ec606584585c21569bd3f7f47f9fb137f64c2f6f96706b7e3178a2ab34f86fa0
font_03_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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