Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb9cca39c9fe2ff…

MALICIOUS

PDF

72.0 KB Created: 2021-04-04 00:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89527a452d5dda4ed7fee029fe50b96b SHA-1: 797bd74371cd9e110d827d8ca8fd8205eb4164de SHA-256: 0fb9cca39c9fe2ff9a8bc3fda6f1e666bbc45fde08f42d4f66224c910caca54b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO manipulation or distributing malicious content. One of the embedded URLs, 'https://jumiwimov.ru/strik?utm_term=printable+wilton+decorating+tip+poster', is flagged as malicious. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to potentially harmful 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://jumiwimov.ru/strik?utm_term=printable+wilton+decorating+tip+poster
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/135aae86f269c.pdf
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/8d173c.pdf
    • http://jinitevuwug.iblogger.org/88292198256.pdf
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/a4ba6a6273a13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/750d8d99-02f2-4b58-8cf8-d50e6ece1423/html_and_css_design_and_build_websites_amazon.pdf
    • https://uploads.strikinglycdn.com/files/aca27bee-ef65-41a3-b41b-6613f4a255ef/xexelagizaritudukemenod.pdf
    • https://s3.amazonaws.com/remavuj/ligizubujebe.pdf
    • https://uploads.strikinglycdn.com/files/e4f42ada-835e-4330-a224-609b1eb3e311/the_story_of_oj_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/c51dd9d7-932c-4c61-9497-c833b7719dd1/introduction_to_heat_transfer_frank_p_incropera.pdf
    • https://s3.amazonaws.com/pewebopufupe/dobur.pdf
    • https://uploads.strikinglycdn.com/files/44b77f3d-c1f0-4142-86b9-71ac7b69ad8e/liratalawatufiguwoxeju.pdf
    • https://s3.amazonaws.com/minaxigevani/22783910407.pdf
    • http://verirajoxa.epizy.com/read_books_online_free_without_ing.pdf
    • https://s3.amazonaws.com/bejokazemur/hymn_for_the_weekend_piano_sheet.pdf
    • https://uploads.strikinglycdn.com/files/0940d2fe-1eda-4a43-ba0e-f905fae0a565/54604655268.pdf
    • https://s3.amazonaws.com/nowokil/65575825272.pdf
    • http://pigunefib.rf.gd/logitech_x100_mobile_wireless_bluetooth_speaker.pdf
    • https://uploads.strikinglycdn.com/files/bd354ce3-deb3-47d2-94a5-ac3b2111f202/buwuxereximiloxuku.pdf
    • http://jevoneloz.epizy.com/muscular_system_worksheet_high_school.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da51.bin
276bfb5c8b9e34c11a99df2bad3964f073965bd715220ed12f64e1d983c97834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 5476 bytes
font_01_sfnt_off0000ed06.bin
d9dc132d5998b991b70a20dcebf248819bc0523666d708afbfe13fdaa3d4ed2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 11232 bytes

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