Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eaea2840e4bfa1…

MALICIOUS

PDF

78.6 KB Created: 2021-04-05 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2b8c512a8eba17b2d71bad87de11b086 SHA-1: 187cdedb7706774321591fd3d37cf60406385403 SHA-256: e9eaea2840e4bfa1aff5c89ea45ca3c6bfea925989d15844622c99807f83799f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion hosted on disposable domains and employing UTM parameters, indicating a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the heuristic firings point towards a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=ruins+of+gorlan+movie PDF link annotation
    • https://cdn.sqhk.co/pigevikuwi/jjeHBJw/password_manager_password_cloud_pro_apk.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/426cb151371d.pdfIn PDF document text
    • https://nemoradusa.weebly.com/uploads/1/3/2/6/132682182/b49f2700366ee6.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jchia19/vozuvajopuduser.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/daxazovedixezomo.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/jhhpBFv/tenomove.pdfIn PDF document text
    • http://abistrans.ru/4611096811082qfv.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/gcghEGP/uniform_accelerated_motion_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/ipihQhi/88661694427.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/hm19qFY/girezotaxugemedaw.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/7944221.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://e-devletodeme.net/the_cause_of_moon_phases_worksheet_answerskcnd0.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/jUIhjQT/24708356633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xulepiwa/how_to_work_out_the_mode_median_and_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff3d009-0253-4f9e-b4ff-5b27726aecdc/father_and_sons_pizza_oregon_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b0ba71-cc78-4176-bcd5-9f717df2a55e/40502115416.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/cursos_de_ingles_basico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b8022f-7344-48ac-b4fe-96c2e98e4c20/honest_work_a_business_ethics_reader_4th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745191a1-e4d4-494f-a34e-2ca1dd901219/xumuvivaxugebuxawo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/35561389003.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/automotive_service_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f8b9a9-b4ed-44c3-b69a-fc9a9dcfc1f2/electron_dot_formula_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 4956 bytes
SHA-256: c0fefff3e197a06a0c8c96eebabdf06feef23be3af9cc74f8cd2db9b5c4b0b60
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10152 bytes
SHA-256: dfddcd4c2ac007aa5052d3920ce4c6edd40386649e3be0db74aa5217f38f028e
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361