Malicious PDF — malware analysis report

Static analysis result for SHA-256 272c6f57d0591fcb…

MALICIOUS

PDF

70.9 KB Created: 2021-04-18 05:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1673af4f9f1c5ea96c66bf0fec514703 SHA-1: 805178b6e80934eb4c2e1dfe29d7a6756d47562b SHA-256: 272c6f57d0591fcb7316952612b28c9d02ae245d45c7919121442daa27a342c0
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=pearson+nurse%2527s+drug+guide+2019+ebook
    • https://cdn.sqhk.co/pixefavenar/jjgehdW/spyro_ocean_speedway_orb.pdf
    • https://cdn.sqhk.co/fasisela/biaLFjc/word_attack_game_free_download.pdf
    • http://ligexekena.mywebcommunity.org/mobile_phone_repair_course_download.pdf
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdf
    • http://vatamuvemazaril.sportsontheweb.net/aquelarre_juego_de_rol.pdf
    • http://jenewazajasazu.getenjoyment.net/the_acquisition_and_retention_of_knowledge.pdf
    • http://tapozifokun.mywebcommunity.org/how_to_change_my_verizon_jetpack_password.pdf
    • http://pemizirevubel.mywebcommunity.org/gireda.pdf
    • http://pukebebizadolu.mypressonline.com/zung_self_rating_depression_scale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bojafazes/neluvofigazu.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_89b0d4c595574097b8a0a4af63487243.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_e5f2683782a142e1a13c0be35d94cae7.pdf?index=true
    • http://rolubumemetujin.atwebpages.com/youtube_videos_panchatantra_stories_in_hindi.pdf
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_2a9f0bb406794b499d766d1ebd13fac1.pdf?index=true
    • http://wejajesenopezoj.onlinewebshop.net/ps_vita_2000_us_release_date.pdf
    • https://s3.amazonaws.com/waduzirader/rheem_power_vent_water_heater_codes.pdf
    • https://s3.amazonaws.com/tugumeb/caida_de_la_urss_resumen.pdf
    • http://rewuwuja.onlinewebshop.net/vonusupili.pdf
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_dfdab033946e4448a6229637fd8360be.pdf?index=true
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_e995327272dd42e7b87b12021404fcd2.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d492.bin
eebb690dd502c6b39ba14b2e25641c4262f06a5d8a37806ca94ba2dcfb3e15c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 5684 bytes
font_01_sfnt_off0000e7f1.bin
703d8d6dc851089fb077a8faaf0cd6030cded197c01e187e80fbd01dc242f389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 10888 bytes

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