Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e511fb782e5502…

MALICIOUS

PDF

76.8 KB Created: 2021-05-30 23:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 475f41469269718b5cd07c9924468c82 SHA-1: 12aba0ca8cd8b43110f6274c0b97b625e467c72b SHA-256: b3e511fb782e55026580c5fc0807f1988717333bc0a37f52e7dc00142bb7a6c3
126 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 disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicates maliciousness. The primary URL, 'https://jottigo.ru/123?utm_term=lagu+speechless+ost+film+aladdin', appears to be a lure to a spam or potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jottigo.ru/123?utm_term=lagu+speechless+ost+film+aladdin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402501/normal_6045810feaae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_603ea2783dfde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375197/normal_5fefebb124cfc.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/4cca1a5771b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_603f861e61156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_6023dc6896572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_603c7ab5dcebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6057189257e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_60382fafc3f81.pdfIn PDF document text
    • https://jupuwova.weebly.com/uploads/1/3/1/4/131409597/muzenokazuk-gukewajupifi-zuxaro-solezigigixi.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/bixobitubumukamege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_60485190dcc10.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/52b70999cadc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488130/normal_5fde654e00b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_602d9c474499b.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/fitibid_dapukuxewilu_lefabowevup_weponezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_6040b7bf4b938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff715758bcd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6034fc8a0d16a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fadb68-5da6-468b-a458-90750ad7c3a7/exemple_de_diaporama_oral_brevet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0144ec9-aa02-4336-995b-9e205599d1c9/clash_of_kings_mod_warband_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8552d1-6454-4ed2-b8be-480f39f58c1e/how_do_i_remove_page_breaks_in_word_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900218af-6cec-409e-a038-c8441f041a07/xexuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09ab452-4ad9-4d15-937e-15aecee452ae/the_birds_nest_cafe_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8bbca5-087a-467d-9a80-605910ab97b5/49588445118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac47dae-753e-4f0b-bfc5-b639690f919c/directv_genie_2_yellow_light.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5416 bytes
SHA-256: c1f41465e13e98006835aa2b45c6a384f4996d807eb00ed106313ced45343b00
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 10924 bytes
SHA-256: cfd5426119159acb1c1d53d0ce4dec18a5d8f384c31dcfd446a3cd5d7fa353c1