Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56c39d41fdb3c41…

MALICIOUS

PDF

86.6 KB Created: 2021-03-19 08:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94509b0ab142a62ab46a3863ce2adfc2 SHA-1: 7ebe544faf9cd6f57281f284a55d24eef4bc9f13 SHA-256: d56c39d41fdb3c41c9d916b704639d8ba50b1759e0abce3c04c3545fc6a400ee
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jumiwimov.ru', which is likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's purpose is to host many links on disposable domains. No scripts were extracted, but the presence of external URIs and the link farm heuristic suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+make+a+funny+wedding+speech
    • http://maewallace.com/2007_scion_tc_owners_manualzzrg0.pdf
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/7720877.pdf
    • http://kmplitka.shop/sitevaxivadebawapafipkccvx.pdf
    • http://xemakaze.mywebcommunity.org/big_ideas_math_algebra_1_answer_key.pdf
    • http://whitecheat.xyz/rupanoxadepisufod58arf.pdf
    • http://bamirajewenexo.medianewsonline.com/text_features_5th_grade_powerpoint.pdf
    • http://vatetuda.scienceontheweb.net/kofupo.pdf
    • http://lowabunuzoxa.getenjoyment.net/5478683252.pdf
    • http://fuwijumazawad.mywebcommunity.org/32934042385.pdf
    • http://sejerodetupumil.medianewsonline.com/how_do_you_unlock_the_advantium_120_control_panel.pdf
    • http://samoe-samaya.ru/foximofi1u22o.pdf
    • http://nadipewin.mywebcommunity.org/nujulibakoxubidumewumife.pdf
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/f4d8ed725d5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c5f15859-bcea-4fdf-996a-964cf30f56b9/what_planets_are_visible_tonight_in_ohio.pdf
    • http://zutugidod.onlinewebshop.net/65857679011.pdf
    • https://s3.amazonaws.com/zobuwubedak/best_battery_saver_app_for_android_marshmallow.pdf
    • https://uploads.strikinglycdn.com/files/0cafbcfd-87a3-43d9-8211-f90350192db0/ver_yo_amo_a_juan_querendn_captulos_completos_online.pdf
    • https://s3.amazonaws.com/fomaralunex/aankh_mare_song_mp4_tinyjuke.pdf
    • https://uploads.strikinglycdn.com/files/bba9cdc2-bf6d-48fc-ba75-5f2aa77f5ff0/batman_the_killing_joke_joker_tortures_gordon.pdf
    • http://limoxukuk.atwebpages.com/why_did_the_us_want_latin_america.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010547.bin
184233e4f0c3b6c1f52c03e82d14bca3092a5a9e51befd00ba863b1f19a088c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 5540 bytes
font_01_sfnt_off00011815.bin
888489ccad25e577dd55585eee0abb7e5b708114af557e7c5597afe5e5230235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 11456 bytes
font_02_sfnt_off00013ea4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.