Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f08f898dcdac39…

MALICIOUS

PDF

77.7 KB Created: 2021-06-01 15:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b4178dc6cf0e3df1720ba8489e4a87ff SHA-1: c7e773fe50f398a123811bf080bffda3f2e06615 SHA-256: 90f08f898dcdac39e6bc00a0abcf31419eaece033eb29dcf3002a46b8d90f3f7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one pointing to a suspicious domain 'coretry.ru' that appears to be part of a link farm designed to trick users into downloading content. The document body, though heavily obfuscated, suggests a lure related to free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=brush+calligraphy+fonts+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5fd320e23f81e.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/3324418.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/fiwoxipalerodu_bajujev_furabukawilavon_galukel.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/netud.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/29eb28206192.pdfIn PDF document text
    • https://fufigejopugip.weebly.com/uploads/1/3/1/0/131070204/budonu_rafipore_bopugojugeniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_600b0df6a4eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_5fd868a639a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_6048cfa2bc40b.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
    • http://dejimebez.pbworks.com/w/file/fetch/144425937/conjuring_2_full_movie_in_hindi_download_720p_worldfree4u.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144461412/86846308714.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/descargar_capitulos_de_la_casa_de_mickey_mouse_en_espaol_latino_mega.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144442707/free_download_crack_corel_x7.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144459429/what_is_jack_like_in_chapter_1_of_lord_of_the_flies.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/evaluating_numerical_expressions_with_exponents_worksheets_answers.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/63272302886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588bb66c-7b78-4625-8fce-c862b425679e/hindi_consonants_with_english_pronunciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d680568-d1d2-4cef-85ac-19623fec9b6b/what_are_the_requirements_to_get_a_general_contractors_license_in_florida.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144447789/engineering_brain_teasers_with_answers_printable.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/how_to_get_25_000_robux_for_free.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144456603/job_contract_agreement_format_india.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144426324/bat_wings_pattern_printable.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_do_i_connect_my_ipad_to_my_brother_printer_label.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/42232834757.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_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 5540 bytes
SHA-256: 9e9a651d86d75dc90d9e8ead7eba85819482afe4c72cd22f6ac6708728421074
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10388 bytes
SHA-256: 8c8643dcbd2a609452548f1b01ad0271eec45a50b5ae695c45ec02d317bcec4c
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2