Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f324f993ede6fea…

MALICIOUS

PDF

78.9 KB Created: 2021-03-28 10:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 075afe15627adc417802a091c89436a4 SHA-1: 0710e3e9cd826aed4b77e3590b9cfd8f98da998d SHA-256: 1f324f993ede6feae4df190f0cf82e22ed0ddc3578132c59df7c7875588a7ed4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked sites. The document body is heavily obfuscated and does not provide clear instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=stick+rpg+2+unblocked+google+sites PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3da1cd389d.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/1271484.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/wepuzenipexija-sikinasapuxodav-rirakijuvojekor-fepukodukafiwo.pdfIn PDF document text
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/6791708.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jijuDhe/96385187500.pdfIn PDF document text
    • https://jugukibe.weebly.com/uploads/1/3/0/7/130740256/55be746dd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_600eaec31c34c.pdfIn PDF document text
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/f47508081aad8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_6048324922076.pdfIn PDF document text
    • https://nawodovifuvobix.weebly.com/uploads/1/3/0/9/130969758/3af634ea8c780.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/cjhjdii/gmail_logo_transparent_png.pdfIn PDF document text
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/3041688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fee18be3fa0c.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/qYjhheg/58147279633.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/gjmcHdB/systems_engineering_v_model_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/5fihVMW/70133067257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d8db12f91a094f0f847e4d8fe9c79422.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/843e0f9e-6a1a-48d5-8408-343ee84f9a44/will_flight_simulator_2020_be_on_xbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb68bfbd-bf73-4231-be2e-727202b6515c/acer_aspire_v5-572p-6454_touch_screen_replacement.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_67ae13e6a3254165a5c9a3253380d940.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/702f644c-b4cf-4805-b3f7-e2ab6a9bf13e/waiting_for_the_barbarians_book_summary.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_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 5472 bytes
SHA-256: f6b7fa9ba8ad7618a9c9838bba80ccb07cd7da7944dffc39f4aed37bf64f6740
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 11384 bytes
SHA-256: e9e678c762be340b28df20fb287fc34dc7b6ca8fc500d032fc4f44b0f57f90c1