Malicious PDF — malware analysis report

Static analysis result for SHA-256 281797416eeaddad…

MALICIOUS

PDF

77.8 KB Created: 2021-04-03 13:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be3909507913614655167c469ba9d4d7 SHA-1: 7fcc396ff966cdf776cf7dbc543d59d933865f2e SHA-256: 281797416eeaddadaa778c5ecc659a7ea3fc1b898158c64f8b5a861cb429d23d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=2011+toyota+rav4+transmission+problems PDF link annotation
    • http://ceiling48.ru/vowewabodugajijosakemezo3zljq.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/907e17982d.pdfIn PDF document text
    • http://spacexfoundation.net/the_100_kass_morgan_settingamzlr.pdfIn PDF document text
    • http://thesimplycompleteseries.com/zokodz4h8r.pdfIn PDF document text
    • http://auto-fishing-rods1.club/pneumococcal_vaccine_guidelines_canada0hqmi.pdfIn PDF document text
    • http://cleanup-sale.site/caustic_embrittlement_in_boilersph1n9.pdfIn PDF document text
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/potepo.pdfIn PDF document text
    • http://static-get.top/big_little_lies_book_tv_show_differenceskpttm.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/17c92.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://uploads.strikinglycdn.com/files/b4eb0075-e558-4bb0-a8c3-6c10f3ff60cc/traductor_espaol_latin_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffc1cee-23ff-4917-8277-baeb380b62a9/zureta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7becfb-d26d-4e16-9652-23bfb3d0446b/idle_hands_make_for_the_devils_work_origin.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/limawi.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/ads-_b_data_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/neruseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becd26a9-e6d0-4d01-b323-228952ea0545/54593282824.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/membrane_transport_pogil_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/crystal_report_server_version_history.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/rukogebotazozafebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299ec85f-e1cb-4e51-a3d9-0d2767eba2f6/heat_n_glo_fireplace_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/the_end_of_the_world_skeeter_davis_in_movies.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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 5376 bytes
SHA-256: b21ca4378e49fc7821f98180f3184199826db0f5a0cbf4fc6f71d7f29149684f
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10828 bytes
SHA-256: 7c9161dc20f73071ca3f166184b6c1c3640fb38afc1f05ff6864b9a52598cd7d
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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