Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7b694f434a8ef1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 02:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2815401629b7c388426ffaf25ccbfd97 SHA-1: 7f519d518ae34a9d73b3a87a9a5539bd0c28c3b0 SHA-256: bc7b694f434a8ef18f66e31ca51481160a385000faeb2da6d9eabc303976df6f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable concentration on the domain 'nipisod.ru', suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=geometry+dash+level+18 PDF link annotation
    • http://gepokupaburorew.mywebcommunity.org/how_to_turn_on_ihome_bluetooth_headphones_ib99.pdfIn PDF document text
    • http://igcopyrightforhelps.com/pequeo_resumen_de_la_obra_lazarillo_de_tormesihtkd.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/Blcgdjg/dinosaur_cardigan_knitting_pattern.pdfIn PDF document text
    • http://nonretloli.site/48472285745nguy0.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/Ihag3mL/download_huntercraft_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/Gmicjb5/15402459054.pdfIn PDF document text
    • http://health2health.online/what_are_the_8_steps_of_critical_thinkingapp1x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toguvaju/lowusitupijexasej.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/pedejotatufiwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98128361-6b77-4ca0-b9ec-cc8565606a80/vuwejebifadema.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/how_to_connect_my_apple_laptop_to_a_projector.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/xosexajoropidifubafiwur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971b9414-053f-46b7-960b-ea4de22d09e8/viwopixuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d5a0aa-96e7-474e-a62b-7d5bac44b15d/5839772726.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/weather_report_lutsen_minnesota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52207d66-f526-45c9-8118-ec7815362dbe/81881934406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ee8170-b51b-4671-ab1e-58012340c40f/dabidosakofogun.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/mudobuzabotosalenak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f6f7ff-d617-4806-95b5-e60518e707e9/7900697778.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/aadhar_card_name_and_address_change_form.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_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 5504 bytes
SHA-256: a0d934f2c3c7cccea4f457b3c4e92d4c329610a2715bbccbaa6ea29a00e9e002
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10716 bytes
SHA-256: 0ca622249e3c676fe91a36557df95719a948e9d07fe8288239e8f0fd6ca246de

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