Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ac1530c76d7c9a…

MALICIOUS

PDF

85.0 KB Created: 2021-03-18 21:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 187d2a6b5398bccec54e77a181d4d1b1 SHA-1: e1e059aaf690517f1f573e358d7095b32ce0f24d SHA-256: 08ac1530c76d7c9a63533a1c1bea84a24ae8f453149b6a2e81501b9f32a1eff5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=kodi+apk+15.1+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453729/normal_6030dc0bc68d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_60349bc3c49d0.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/NqjhX7E/barbados_passport_application_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fe7b0d0c082a.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ibieib6/cute_kawaii_computer_wallpaper.pdfIn PDF document text
    • https://vasetovomakoti.weebly.com/uploads/1/3/2/7/132741031/7ba29fba527c.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/YidoVUS/fluxx_hoverboard_manufacturer.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/2165afd5820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_60217328dda15.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/igijdge/zimimipufilakudejokep.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/durasowozugo.pdfIn PDF document text
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/riporizoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/diaTfij/crown_princess_cruise_ship_news.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/XobZnia/countif_not_blank_smartsheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483839/normal_5fe407cf3b203.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/agcqIjb/deeeep._io_beta_evolution_tree_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_6008d50d0fcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_60537d181d248.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/c1EjUaF/xuzagejedipodoxolodi.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/hhhiDWu/live_stream_cable_channels_free.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/kitakilesa/49586871641.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/in_search_of_answers_destiny_2_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/vekemimolatufopokilek.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5012 bytes
SHA-256: b494627e6a7fbf20e6df4b10099d997a7fb82c3a6f3afdfafed77fc5f56464c6
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16376 bytes
SHA-256: 7e6d61d3874ae94e2e2603a2c5f6b092a26fac2df62281a7a6b2486eb0b9e755
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449