Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ba7166ab416de5…

MALICIOUS

PDF

81.3 KB Created: 2021-02-17 11:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 593d2d1fcd5b99a3b5ac31ea25ef91a9 SHA-1: 4221c49145de62ee69ca321505c5b345b4f71f4f SHA-256: e1ba7166ab416de5877eb5dcb49e542ec9192a8e5d95ec7d733bb814fb6c104d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links points to 'https://baarspo.ru/strik?utm_term=what+are+risk+assessment+analytical+procedures', suggesting a redirection or phishing attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure suggests a malicious document designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+are+risk+assessment+analytical+procedures PDF link annotation
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/zaxuwi_fosogagixopi_bukofexunapidax.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/wajujajepuzo_rudogizetobeju.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/Qjh92hd/elite_squad_vs_zombies.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/dukomaloxe.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/7MFhdyv/spin_the_wheel_game_show_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/heghmtP/tizesigefudaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/hgctj66/suvujedasulawuvoxaras.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/rofadolik-bozamer-zimezu-pavumufazu.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/Fgd0yfD/lufelazedeni.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/icrhdhe/powojebum.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/rmhdBVe/six_stack_overwatch.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/tdfiibF/lipevejitamumewudo.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/9aid14N/99718899925.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/njdAdjg/16911758064.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/bubobexowipazok_jowogapagoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vunizi/norujirilowokovum.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/creative_writing_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/16137581364.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 5376 bytes
SHA-256: 2a5612f644be98c9905ff7a229dd9a36954bd2e24baa52dee2115bef4778e013
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10596 bytes
SHA-256: faf260c005bea4959ac3fa7695322c1e294f579fe8ecbc6039e4e09d66646817
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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