Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8532c61e43a11a3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 01:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c017c5fcf6386ca2103d3bd09009524e SHA-1: ef2dcda52cb8a885e9e758735c835844aaea7f6b SHA-256: e8532c61e43a11a3f63929b708eb982baf461900a66d336806442dbeae621992
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to disposable hosting services, suggest a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/award?keyword=animal+habitats+worksheets+pdf PDF link annotation
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/fcb9b8c98af2.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://gabumisuxenumu.weebly.com/uploads/1/3/4/3/134366459/bozaj-lavixubamimapu-tiwuf.pdfIn PDF document text
    • http://katermore.ru/478945513628o7my.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/memuxabafapir_vifokesifozelas_jukub.pdfIn PDF document text
    • https://tigopovon.weebly.com/uploads/1/3/4/2/134235173/jisoniro.pdfIn PDF document text
    • http://pipvip.ru/basic_calculus_questions_and_answersuj5zu.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/rijjcny/kitekawamowaminitoj.pdfIn PDF document text
    • https://tivaxuxilo.weebly.com/uploads/1/3/4/1/134131375/pusimobefani-kurokemijuteki-moliromeditarok-kesele.pdfIn PDF document text
    • http://supportcopyright.net/rafumivejncfx.pdfIn PDF document text
    • http://theraisins.pro/spring_boot_jdbctemplate_inserthqj8u.pdfIn PDF document text
    • http://lalashoppen.online/how_to_use_steam_fresh_on_lg_washer1fkue.pdfIn PDF document text
    • http://salonop.xyz/letupadubonamemefegobm1vow.pdfIn PDF document text
    • http://idealica-italiaoficial.site/english_speaking_book_pricegijxo.pdfIn PDF document text
    • http://leftoutclub.com/childe_harolds_pilgrimage_canto_4nxgi4.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/zozegoxibupitavig537g1.pdfIn PDF document text
    • http://arfesopt.com/29859303913n1ro9.pdfIn PDF document text
    • http://1xbets-reg.site/glenfield_model_60_stockatkhu.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/hgbPjbV/lunita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad179f0d-3bf0-49c0-be40-914325afc866/are_flushed_cheeks_a_sign_of_labour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccecd5fd-8e0c-4b78-a1b9-95319f049280/su_lenguaje_corporal_en_ingles.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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 5568 bytes
SHA-256: 5ab4666196561ba1c7bd68ad452484537612a01f59867dfb176ef7db2491ce4a
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10988 bytes
SHA-256: 8ebce5a43916674fa5ae663692b08435d36e4330c2810350039a51f309f60b19

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