Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb217d1b8cb9616…

MALICIOUS

PDF

84.7 KB Created: 2021-05-02 01:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d4e9ecac77d79fbccc24df54c1013ae4 SHA-1: 274fcb121f182328a4857689facec2d33c791466 SHA-256: 5fb217d1b8cb9616e0e6cb2a53d0177f6505900d9dc21c50540e8cef80f74ca0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or scam lure related to a product inquiry. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=bosch+nexxt+500+washer+not+draining PDF link annotation
    • http://tehnotop.space/dawegovemuwublh2a.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/43107599770.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/84170688802.pdfIn PDF document text
    • http://milanbeachs.space/human_lifespan_in_18006xnpd.pdfIn PDF document text
    • http://gelchlen.fun/nivabunibuvujarujiwarelod0yzg0.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/ecocardiografia_libro.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/mtg_complete_neet_guide_biology_download.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/kovuvo.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/conducting_patterns.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/fa8a6b75-f160-4e2f-965d-c31b01a36845/wufefumolawovatotapijal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c537af-bc37-49db-97a3-120996665205/77405535763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2648e6-ba75-4629-9c75-c2bb8f8140d0/the_voter_by_chinua_achebe_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a662fe-7ef2-4423-9552-812e158c36c6/understanding_media_the_extensions_of_man_apa_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/fupotalominekuzededer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbc8c81-748e-41f4-9c71-97b9809eda9d/kesikesiwowobujale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b3f47c-d938-4775-bc66-bc9d226f1ee4/zogodotananowigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e96c666-5f3c-4105-b055-b2084a4fa734/tixunuxazolakelok.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/chemistry_student_textbook_grade_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c853ee7c-8676-42f1-a2e8-93da3098218e/62410549765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39ad2eb-ee97-40b7-9363-42a9f3a013c2/how_to_put_ratios_in_a_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/thousand_songs_of_milarepa.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_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 5644 bytes
SHA-256: 713aaec9591b607f29c317986f87c84d6907aca9c954074d6edf9ca743e98dc0
font_01_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 11372 bytes
SHA-256: a8b3da58ee8a889dd907d8c1898d79358d1c061c003d3ee399098c47282b9d1d

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