Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b40f3ed57aa5c4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 01:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b9016e3e1294ed27c847dbf3729ba1ec SHA-1: ea784d8e26d0a3bb92f113a94e57c6c2ada85f3b SHA-256: 23b40f3ed57aa5c468922a21f32e78fe2ccaa0366133305a4daac39b5f459ae0
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's primary purpose is to distribute these links. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/123?utm_term=bullfighting+in+spain+information PDF link annotation
    • https://cdn.sqhk.co/xewasejeve/pghjjhP/source_code_editor_definition.pdfIn PDF document text
    • https://pemanawawe.weebly.com/uploads/1/3/5/3/135320082/1c421f7.pdfIn PDF document text
    • http://savuwit.iblogger.org/spanning_tree_protocol_security_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/ZghLNPL/furelavewerixaperige.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/kigesimuwuze-vefikelawavaji.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/wosunefowanurox.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/the_difference_between_male_and_female_brains_youtube.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/2b44b.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/pilosepunun.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/xiwavabon_nexofimusomoba_nunufana_lixusewesetosup.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/039359e1eddea.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/gasixuki.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/zukanefitexaxedolajuwudoj.pdfIn PDF document text
    • http://duperalenow.22web.org/hemaris_thysbe_bugguide.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/jjeAc9o/pobaza.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/m8geEhg/96386239380.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/9936613.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/DgfIbPd/koniwowokixolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizekalukojulap.rf.gd/dias_feriados_2020_en_pr.pdfIn PDF document text
    • http://xomesozumifa.rf.gd/thanos_endgame_wallpaper.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/how_to_make_manual_in_word.pdfIn PDF document text
    • http://lakiver.epizy.com/6753255335.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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 5364 bytes
SHA-256: d29f1ebea22be67e3ec8ee16611bd28613bd0a9495ff473ea61da21dcc8c0245
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 11408 bytes
SHA-256: fc84bae43aa3ae8a72e8da79ae169953035a39e630049f81f4cf7353fad7f479

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