Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa322ef6f7f3577…

MALICIOUS

PDF

72.2 KB Created: 2021-06-13 12:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25b37dedebb78a29a797300629e08561 SHA-1: 0527f53c99f5861505ecfb957ac428f350950731 SHA-256: 4fa322ef6f7f3577b18e36415105d0053660f97b33c2bb289a3d60e226ea4a9b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to lure users to potentially malicious content. The primary URL, 'https://oniceh.ru/pbw?utm_term=poweriso+7+serial+key', indicates a phishing attempt related to software activation keys. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://oniceh.ru/pbw?utm_term=poweriso+7+serial+key PDF link annotation
    • https://nonufovoda.weebly.com/uploads/1/3/0/7/130775853/19e9c885f414.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/selikejajot.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/d7a67.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/sugidamogetuje.pdfIn PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/tadexogopu.pdfIn PDF document text
    • https://ravawulivu.weebly.com/uploads/1/3/2/6/132682570/3889855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144436320/aborder_une_fille_par_sms.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144615168/what_is_class_a_vent_pipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdafeda-04d4-4ca2-936b-0863389f351f/the_practicing_mind_book_review.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/211_games_bleach_vs_naruto_2.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4dc865e-dd08-48ee-8833-6a078f1f8244/tugezifopiwotikebemajita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639a537e-4b9b-4a16-8cef-c1fef9b58a7b/2020_club_car_onward_dash_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40b23d6-adb8-4dcf-8b9f-1768a668575a/bexebofefi.pdfIn PDF document text
    • http://kufugaref.pbworks.com/f/download_corel_draw_x4_untuk_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2770272-8f41-4ab5-b2b7-2c5c82d5946f/41933524222.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427671/43595108660.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144419745/87516666761.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/fhrerschein_formel_bremsweg_reaktionsweg.pdfIn PDF document text
    • http://gisugakeg.pbworks.com/w/file/fetch/145110693/2578411954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cac2f2-b30c-4d55-8b2e-9915f1d22411/selutifejeto.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5020 bytes
SHA-256: bd1b23d3ab1ed47dfcbe8649e4ae3bc30e1bbd95eb81f0a75c79693a072e99ac
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 9944 bytes
SHA-256: 0da25682ea978f64b9bacab8e5c0dde4b59450918481a22bc264908ec74f4067