Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7c3f5b03c07943…

MALICIOUS

PDF

82.3 KB Created: 2021-04-25 14:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9102f8ffaacb57584cc70ca07dbabc4a SHA-1: 28dad2861957c83e232f8fa8989e922ff18d9ba4 SHA-256: fc7c3f5b03c079433720f43bf4286646de35509f22c7c03dde9d60e2f05dd399
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with at least one, 'https://jacksth.ru/strik?utm_term=nikon+coolpix+s4000+camera', appearing to be part of a phishing or malware distribution scheme. The PDF also functions as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jacksth.ru/strik?utm_term=nikon+coolpix+s4000+camera PDF link annotation
    • http://zatoxuvisovapuf.sportsontheweb.net/gulos.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/hc6hKgg/the_sims_freeplay_vs_the_sims_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/gCgrhcj/cops_and_robbers_video_game.pdfIn PDF document text
    • http://dimax.website/65148696795s6397.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/6411073210.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/jar7giC/uber_driver_car_requirements_florida.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/5684c0873.pdfIn PDF document text
    • http://worldhold.online/blank_page_photor3j3r.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/8078317.pdfIn PDF document text
    • http://nosatines.mypressonline.com/mefasedimibakujefipi.pdfIn PDF document text
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/5287158.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/iYRBdWU/captain_america_2011_tamil_dubbed.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/vibisexotuvu-tesidafuv-busasenifejop-kotuwagukaxe.pdfIn PDF document text
    • http://axecheat1.xyz/bfme_2_online3uzds.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/what_is_the_most_difficult_question_for_a_forensic_psychologist_to_answer_correctly.pdfIn PDF document text
    • http://tumbochka.space/59909577395ku3t4.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/giMpuQV/74682448127.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/jenkins_dotnet_core_3.1.pdfIn PDF document text
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/6ff7a5e51dfeae.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/a0eda90.pdfIn PDF document text
    • http://russianpatentexpert.com/79384355300er9w1.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/7a08fbfc-8665-4d3f-9c0c-c71af196d32d/ziwadelabebov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b247a28f-17df-42e8-9ded-7a0a06c93a72/what_are_the_ranks_in_the_nyc_police_department.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab808597-1980-4341-b4f4-41a8c41ff751/why_is_my_2002_ford_explorer_shaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a26dad-d810-40b7-bf33-2188f0bc69b5/home_theater_samsung_ht-j4500k_precio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58679636-cdce-481c-93aa-011fb1a4725b/51401098552.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_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 5408 bytes
SHA-256: 463186722855b34b6cbcb70a4adca3918eefcfe40bbad4c122b059939196f234
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 11884 bytes
SHA-256: 796c141cb64123670164f582007e5b81c0fe7bcfb767e0d5147937bfc04f4046