Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c697572cc7a53…

MALICIOUS

PDF

73.5 KB Created: 2021-03-13 21:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 838247530960b928ef9dd4b1d5d1b064 SHA-1: d844a92b9b18cb98c68ddd8fd69b2856c0c3ee51 SHA-256: 350c697572cc7a53e644e16c7316072b5835d2a7f09ecb619395efdd5cd5bac5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to 'dafemum.ru/strik', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=pilot+instaboost+walmart PDF link annotation
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/bawuwofuwetonuge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fc801a569eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_60460d243e539.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/call_keeps_stopping_alcatel.pdfIn PDF document text
    • http://sigiwisami.iblogger.org/ca_lease_agreement_example.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/demibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_60373bec18e7b.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/wifi_gsm_home_alarm_system_manual_espaol.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/7497052517.pdfIn PDF document text
    • https://xevexotu.weebly.com/uploads/1/3/5/3/135309825/3383392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/geronimo_stilton_season_2_episode_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435a0ada-fa0b-43f6-b308-0617d37404f7/gtx_970_strix_overclock_msi_afterburner.pdfIn PDF document text
    • http://ramivomeduz.rf.gd/narelutosobipa.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/tejomuxiroradapuj.pdfIn PDF document text
    • http://biburusig.myartsonline.com/accessory_to_war_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce549614-3e27-4290-bf80-5629f7eef00c/sims_4_2020_update_issues.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/importancia_del_monitoreo_de_signos_vitales.pdfIn PDF document text
    • http://fefekug.rf.gd/how_many_years_will_a_dyson_battery_last.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 5064 bytes
SHA-256: 0971841653be86d3eb69ec326b1563e46f3e4859f76f1ca44ee449da2fec796d
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 11240 bytes
SHA-256: 503fc83a5cd9c07935277bf58952e306faafc0cddfa3b1e43df8181d14019a93

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