Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff79159e2e0a1180…

MALICIOUS

PDF

78.3 KB Created: 2021-05-14 23:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1e83c94f3f0cbc9ba2aaedfaf022ca80 SHA-1: e9defb76fe27daed56d77a6bd6778f92c6f32bea SHA-256: ff79159e2e0a1180b211a4dd72c23ca68e67c11a95d31ac33d77f450c1dae85d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Autocad 2020 tutorial pdf download', which is likely a pretext to entice users to click the embedded links. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=autocad+2020+tutorial+pdf+download PDF link annotation
    • http://dobomasinuraz.iblogger.org/21221016980.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/kerobesulakugot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexiwamuwi.rf.gd/law_of_requisite_variety_in_mis.pdfIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_5e515ccc146b41b2b9d124daede81cb1.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_d3cbd7929729401d816e390ad0b7922c.pdf?index=trueIn PDF document text
    • http://loluwoje.epizy.com/how_to_annotate_in_notability.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/lg_hbs_820_pairing.pdfIn PDF document text
    • http://xosumuzav.epizy.com/ubuntu_google_drive_link.pdfIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_1017271298644c29ac51dfbc0c597ed5.pdf?index=trueIn PDF document text
    • http://refowokewip.rf.gd/80760084615.pdfIn PDF document text
    • http://dexixikix.epizy.com/71424289882.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_feb262fa242942098960985591a3ca59.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_320c2908d9c84ddc9aaf18c377ca2f21.pdf?index=trueIn PDF document text
    • http://lorenivi.rf.gd/98754756013.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_d76905f5813c4c6ba94b4ba12a5f4a5a.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_fa56759bc3e74997833963fce301c509.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_e457d145b4524179b8dc20c1c94f168b.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_1adfe471b29e4903b552cbcd049ad0ca.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_4dbd64b3652a4cc886a8753e47f11598.pdf?index=trueIn PDF document text
    • http://tevoburowuvule.epizy.com/jesetipojavomikexagadum.pdfIn PDF document text
    • http://pidawuz.epizy.com/histoire_de_l_ergonomie.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_4dd7e64b17ac474abb2d0b80c70d3fec.pdf?index=trueIn PDF document text
    • http://mopuriruwinufi.epizy.com/explain_why_all_organisms_in_an_ecosystem_are_interdependent.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5328 bytes
SHA-256: 6462355aaf1edf4bd57d8d01760101ff2b57b67558a2476bb40357b0d5061e62
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 13180 bytes
SHA-256: 4b385d5287b3f0ff48fba377ff0566e1bcf29f8494a37bd3f94d7f41d4218379

Open this report in the interactive analyzer, or submit your own file for analysis.