Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1af6e5b064e7f6…

MALICIOUS

PDF

75.6 KB Created: 2021-02-09 20:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 464752178a7afee038615dba77d5244c SHA-1: f22d5c4aad48401d71f1bc51eaaf7ebe0ca1ae2b SHA-256: 4b1af6e5b064e7f633577ed62ae655c98f8cc6102f166551746d2fb0e067a081
66 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and an external URI is present, pointing to a URL that appears to be a lure for 'Assam university online admission form'. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URI suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/wb?keyword=assam%20university%20online%20admission%20form PDF link annotation
    • https://cdn.sqhk.co/vonezositixi/jFXjhaz/fun_free_song_ringtones_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/7jahcSg/mcdonald_s_menu_prices_2020_hawaii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_5fd87847a53e1.pdfIn PDF document text
    • https://voluwunuzusiju.weebly.com/uploads/1/3/1/4/131452861/ligalix_sorujowi_tatavukot_tixeg.pdfIn PDF document text
    • http://allieshouseofhope.com/crazy_taxi_unblocked_games_66q90rd.pdfIn PDF document text
    • http://eliyalte.com/guramakilasudolepativewabrqzb7.pdfIn PDF document text
    • https://jiwalevimube.weebly.com/uploads/1/3/4/8/134870165/mabufakas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_6004c42062d69.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/pesewariwi.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/menifevekikajawuxaku.pdfIn PDF document text
    • http://jilet2.club/alimentacion_consciente_libro0mjws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd22655ef83c.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/zodarakemaludazedevazakeudckz.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/gU3haii/srs_sigmoid_colon_surgery_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fdce119d0c70.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/rijaliwiguvex/57889748502.pdfIn PDF document text
    • http://megoger.rf.gd/chlamydia_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/wajofogalosiwokaduwet.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/goxirofinuzos.pdfIn PDF document text
    • http://ravigokabuf.rf.gd/ibm_cognos_report_studio_case_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/zelulexaz.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5204 bytes
SHA-256: 64c057508e5cc9d906933ffa692feaefba40ebcaca91a6104d869bd5c67dfc88
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11308 bytes
SHA-256: 93f2e1f487726eb29913135107578dbf71b06074aafd4665febd7521d8ec4eda

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