Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c68f25c338f2011…

MALICIOUS

PDF

139.7 KB Created: 2021-03-16 09:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c447fe9164cda6165840e33fb25445a5 SHA-1: d9e6211a1e7160f989261b4473552b888af58f46 SHA-256: 3c68f25c338f20114995aa660a30b076128b445a4841f494b01beb96b2e953ca
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or link farms, indicating a malicious intent to manipulate search results or redirect users to potentially harmful sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=sunidhi+chauhan+songs PDF link annotation
    • https://cdn.sqhk.co/nivavepe/ctnhiHM/game_of_swords.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/iczjdie/berserk_manga_volume_38.pdfIn PDF document text
    • http://fikunigogijori.22web.org/a_christmas_carol_2019_trailer_deutsch.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/loxezufaguwibebewu.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/how_to_program_midland_weather_radio_wr_100.pdfIn PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/1656168.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/azar_blue_english_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/agfjINJ/disenivopaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/SvMgd6D/stickman_battle_2020_stick_fight_war.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/ig85WX5/jutivisupuputisakudev.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ggGifXP/green_bubbles_car_wash_brookfield.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/kamadu_linexalareba_zibiwozis.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/get6fig/jvdroid_pro_ide_for_java.pdfIn PDF document text
    • http://budonap.iblogger.org/android_sqlite_tutorial_step_by_step.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewiwoladizot.rf.gd/how_to_find_density_with_length_and_mass.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/reasons_why_my_car_ac_unit_is_not_cooling.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/insensibilidad_a_androgenos.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/todo_sobre_centrales_termicas.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_off0001e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E904 5176 bytes
SHA-256: 09d6d7a89afb17ac747d3465a715fcbe5ff2d69822f5d863ec0cefe81a45d092
font_01_sfnt_off0001fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA9C 11596 bytes
SHA-256: ec1dc7603d3521289cfa5effd8c3cec549a8a7b632516762e5a847936bd5fe7d

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