Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f6f75831a6a843…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 08:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d95ffc5bab6004dfa3763d211f46aac9 SHA-1: fb3628b4c57f00b0952ec6a5b40a104e415f828a SHA-256: 25f6f75831a6a843bef38ea7c13b4d2d269d322d496409b96bce2b6430837543
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 high likelihood of malicious intent. It contains numerous external URIs, with a prominent one pointing to 'midufefew.ru', suggesting it functions as a lure to a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/award?keyword=ansys+meshing+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417423/normal_601fbf26c3604.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/9308819191ektzo.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/how_to_read_strongs_concordancevj08e.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/Ufs5hic/robavewufogebomite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_6053e87dbd55a.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/D5ibgiu/jigisexapulajufukaramezuz.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/bilanzkennzahlen_bersicht.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/ielts_recent_actual_test_with_answers_vol_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_5ff0a3af59584.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/fgfiGRc/black_library_audio_books_free.pdfIn PDF document text
    • http://scrlt.xyz/12116017855xwtea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ffa19e7478ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcad00bbb6e9.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/iMghijH/14974980626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5fd8be7ec8a16.pdfIn PDF document text
    • http://repair-kompov.ru/87214875974p39i.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/FCJghha/birefafenaturoluleg.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/doom_patrol_characters_rita0b6b6.pdfIn PDF document text
    • http://polizoriv.iblogger.org/97134418823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_602b829bc62b6.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/the_cask_of_amontillado_full_story.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://nelojodopon.epizy.com/webuleweveteminuzibi.pdfIn PDF document text
    • http://zititerawori.epizy.com/rindu_berat_camelia_malik.pdfIn PDF document text
    • http://pisibide.epizy.com/how_to_check_dojo_points.pdfIn PDF document text
    • http://wuxojawe.epizy.com/sstream_header_file_in_c.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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 5428 bytes
SHA-256: b7da2ebbbf6dcebed368c644c27d4dbfe8dd0b2cbc2880605eebc5db6548e4c6
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 10948 bytes
SHA-256: 7b924028e979626dd60f6a475d65d6cb82257a65b2033e4c45fb47ab3f7350d6
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f