Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf319f907b8833c3…

MALICIOUS

PDF

76.9 KB Created: 2021-05-19 19:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f9e90481cf89c32c2a30841a4c8b8b4 SHA-1: 7a3e245a0214c74269b40dd772908ea46e3c13fb SHA-256: bf319f907b8833c3417ee8d1608974b28c6318f857953dbdd29c3e4609769ec0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=similar+triangles+and+proportions+worksheet In PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/3e37fc771b1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_602b2c9713adc.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/xivoxuti_kujedulig_mamila_zanafig.pdfIn PDF document text
    • https://wadagoxegoti.weebly.com/uploads/1/3/4/3/134385229/nukuxa.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/guriwanufaneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_5fe912d8d0fa7.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/c6b0b26f-5317-47ce-8f66-ddbfdaa19dc5/answer_sheet_panjab_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8228aea-79ba-4892-9f6a-0559138989b1/cant_login_to_dd-wrt_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60d1daf-1f79-482e-ba48-225151afb0fc/wizogazewokunowuwuzoralo.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/39961493138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfaa6b2-2ed8-483f-9ce3-dad06ff8c299/vakefokiguwafebaroxewaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b87a78-ee2b-4c42-b2ae-7858769f281f/2482115584.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/template_hoodie_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/visio_network_diagram_software_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/18864128518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e58eb4c-ff1c-41a6-a949-18e81735b0ee/pebanolorogux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edc5320-cc8d-46db-812f-6eddb27c4cb6/givupuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9322b22b-30f3-4865-a09f-8e8492639063/vukiwikovazekuriso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f36411-ba43-4a06-ad10-f2219ee38900/pogegexosibolivovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a76f4a-752f-402d-bfbc-5d2c77c47900/saturated_solution_definition_science.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/dafexupivevusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd94228-ac2f-433c-9e25-2bd716c0c394/what_is_a_visual_representation_in_math.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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5632 bytes
SHA-256: 09bb65f11a26415c2405eb7df83e7a71724a502c59c36d6510c4816e6a51f1ad
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 11696 bytes
SHA-256: a08aa457aeb237cb68a0ac60996e364df1edf4af0670385a25ef0b8afb4f89da