Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1948bfa99fb132…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 09:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7fe844c54fcf8a9b1cccdd11493df783 SHA-1: ab4a97fb9b2c77a252d4b34d9c9f25c906d87a40 SHA-256: 3a1948bfa99fb13292f9837a4eb65572c18a2cd705d7ade061a6484a29a316d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('nipisod.ru') and using a search term ('2018 forester 2.5i limited review') as a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=2018+forester+2.5i+limited+review PDF link annotation
    • https://cdn.sqhk.co/bumogebiz/jj2gcib/scummvm_emulator_download.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/dothjbu/marine_recruiter_cedar_rapids_iowa.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/cgfRe59/82337320931.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/jgdEU0G/tiktok_mashup_august_2020_new.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/gc6hdgf/figutikerutefi.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/cjeicjd/foworedukemuvudugoda.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/cFVyi1O/kijofifozebuve.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/sgeO2fz/zidanalowagexirelaz.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/AcsPiiq/juicy_fruit_chewing_gum_calories.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/wamawuburosuwanaxusi.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/jghflja/child_care_assistance_mn_covid-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/RKTNEOQ/81496044660.pdfIn PDF document text
    • http://dikerulaba.22web.org/derailed_2005_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/OHhaSXj/32206258985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaroxovi.epizy.com/oil_furnace_heat_exchanger_replacement.pdfIn PDF document text
    • http://niruvizuzeta.epizy.com/malayalam_calendar_2019_free.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/best_movie_tv_app_android.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/battery_percentage_android_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c31785d-a789-486f-abed-d42ff3df2eae/what_is_a_seasonal_cashier_at_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75067b6c-eaa9-4cc5-857f-3d23c28e332d/62868897625.pdfIn PDF document text
    • http://govakuvi.epizy.com/wipik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f293edb9-5bcf-4068-b58b-290fef493440/64538631389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883318d6-7764-4b97-8a5b-4c3bbded9e95/75081894530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d91c3a-cc39-476d-9e7d-7315d30d8e88/what_does_mean_in_javascript_dollar_sign.pdfIn PDF document text
    • http://medazigudid.epizy.com/analytical_solid_geometry_krishna_series.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_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 5576 bytes
SHA-256: 104ff1d864d72fa2e7cb1c807dc0add949a88b9d8428af6a6db32a44d1cceef6
font_01_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 11084 bytes
SHA-256: 112753c3072e351e106fb4780bedaf3dfda8bb39b94ec7f22289fd46cb01a154