Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc1b18d7aa9f75…

MALICIOUS

PDF

76.8 KB Created: 2021-05-23 18:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5822acc365f00cb8d9ef0c2c7c5521df SHA-1: 6ffe6dacb2e838d81a3ec2493a5d19580d548e21 SHA-256: 74fc1b18d7aa9f754788fb18abba0d339b112b3f63cd370441ecb0faba17462b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam and potentially malicious redirection. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, with one pointing to 'https://xezojetit.ru/strik'. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to a compromised site.

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://xezojetit.ru/strik?utm_term=making+equivalent+fractions+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471692/normal_60088d37d504c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_605a210b21cb8.pdfIn PDF document text
    • https://vogexuluvudo.weebly.com/uploads/1/3/2/6/132695782/pelodo_getudo.pdfIn PDF document text
    • https://pesilanolaz.weebly.com/uploads/1/3/4/3/134330173/7a9e73419affa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fcb677e34c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_60156373a1004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_602d2e749b7dd.pdfIn PDF document text
    • https://jabanomazekapuf.weebly.com/uploads/1/3/4/7/134743752/131921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6056a6a7f0593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6045faff6df64.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/dfebe5f368f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_6059a6bc828dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/figevosemuwositozenuzije.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/63039760138.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/xakabokaxugebeb.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/83393678606.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/67783581791.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/alloy_625_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/difference_between_nvl_and_coalesce_in_db2.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/vampire_diaries_book_1_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/anjaana_anjaani_movie_hd_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/suwobujejorewubom.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_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 5764 bytes
SHA-256: 9558c42588ae81f20a8f249c0ee4170aac116ee6169a42850a26c694e580e422
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11860 bytes
SHA-256: 4f640bd4aede58d83eb4004fe4497bc3249a91266288296b2dee458b1eaf9c82

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