Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a10206e71233048…

MALICIOUS

PDF

71.0 KB Created: 2021-03-20 18:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ce4a0cb1e1e0eb035964642ff2803fd SHA-1: 502f1ab3461f255a21fb2908e590f0e75ecc14b3 SHA-256: 4a10206e712330487bafca8aa933638b407eba86ea948a89f0c0a377df17e7f2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are presented in a link farm configuration, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed 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://xezojetit.ru/123?utm_term=movies+tamil+2019+free
    • http://kellys.space/interior_design_salary_chicagoreh8k.pdf
    • http://daduriwikoniza.22web.org/windows_10_wifi_driver_64_bit.pdf
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/vadejolelopibegesu.pdf
    • http://0fruit.space/how_to_learn_to_draw_realistic_facesq8zku.pdf
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/7f43f01.pdf
    • http://pelistens.xyz/30060619078vexwy.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/4c70d938e6c.pdf
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/59802380e1194.pdf
    • http://joxezorov.mywebcommunity.org/79293148607.pdf
    • http://nijepatexosanus.medianewsonline.com/43630019554.pdf
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/puxogikodas_zugulelev_fadop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92b2d2fb-25f9-43c2-924b-f159b94b26df/how_do_i_setup_my_hp_officejet_3830_to_print_wirelessly.pdf
    • http://buzanuziti.myartsonline.com/mepive.pdf
    • http://luxexobaw.rf.gd/fios_remote_volume_not_working_samsung_tv.pdf
    • https://uploads.strikinglycdn.com/files/70151a30-df5c-4819-8dc5-0b691a4c1731/71434139104.pdf
    • https://uploads.strikinglycdn.com/files/5079a29f-acb6-4abc-a46f-d80e6ce62796/dotepe.pdf
    • http://tukutuxobolekub.epizy.com/1685647705.pdf
    • http://bozexefuj.epizy.com/birthing_plan.pdf
    • http://kowotasube.epizy.com/rinaludagaf.pdf
    • http://gajibapudi.rf.gd/nupizufol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f4.bin
6642086039e08cee1501f373db717b98d2aecf9ed60b933fb3081c6c9f7b12c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5460 bytes
font_01_sfnt_off0000eb86.bin
6e42c31eb4d55eb3f2a7c208f12fedc7c64fac0a2a8586f591b8aed42e1fd73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 10872 bytes

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