Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83fff291f11cb96…

MALICIOUS

PDF

78.4 KB Created: 2021-06-06 18:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a66436c6009be7d152600cc36ff212d2 SHA-1: 9710f22a47f09c93461079d1a0b0bcde3b714ea7 SHA-256: c83fff291f11cb960fadf7342fb8444eda95c4c2dc8eeac4b4c738d63db11e1c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=how+to+connect+a+blackweb+wireless+mouse PDF link annotation
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/2960323.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/3140200.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/8204242.pdfIn PDF document text
    • https://gesovomovo.weebly.com/uploads/1/3/4/7/134716395/jofep_junipuzokinap_nabegozufobupew_lowukividirowar.pdfIn PDF document text
    • https://lidajegufevu.weebly.com/uploads/1/3/5/2/135299661/11a3149d56a7.pdfIn PDF document text
    • https://gifefetetax.weebly.com/uploads/1/3/4/8/134899892/dimuzilu.pdfIn PDF document text
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/8596395.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/541f18.pdfIn PDF document text
    • https://bageribo.weebly.com/uploads/1/3/4/5/134592059/bizigar.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/d4535644-b3f7-4f0d-8b9a-9b3b523ceefc/23043087255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b6e470-88b3-483d-8f70-7a39baeb4b44/83435229168.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144680385/kixipodejozuxaluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2433e8b0-8071-42e4-9ef0-64bffd8e808a/kali_linux_default_password_live_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25703638-d3cb-438e-bd5d-12a0a498be7c/17066885933.pdfIn PDF document text
    • http://jezopisi.pbworks.com/f/pokuwazenegono.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/14663414476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3412e0-aa77-4295-984a-1d95afe05f84/57644332069.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420144/guerra_mundial_z_2_pelicula_completa_en_espaol_gratis.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144647853/cmle_dzeyinde_anlatm_bozukluklar_km_sorular.pdfIn PDF document text
    • http://suniger.pbworks.com/f/what_do_the_georgia_guidestones_say.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f035af93-7367-4033-b8bb-d35cb8f0f388/1949039744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25911d27-ed30-4c51-9a2d-eb60379a7954/norevubunu.pdfIn PDF document text
    • http://pekazaxe.pbworks.com/w/file/fetch/144606801/how_do_you_hook_up_a_ilive_sound_bar.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/70098334956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0152b01-1863-4d54-9731-99a8ef730e30/nibizusibevap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 5200 bytes
SHA-256: 11e758455dcd61a37e2b6bb8b6a12c53748c78ff402b047449237f94284f72d5
font_02_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 11644 bytes
SHA-256: a6158ad2932e60b8b6d7c8fe80d46b08f3af5adcbb5e276947a49cf42dfef418

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