Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cdd3dd3100f7f0…

MALICIOUS

PDF

132.1 KB Created: 2021-03-17 05:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8fe87dd72de78285d831ee635954746d SHA-1: 2f8a48dc795419c58f8b67cdcbab517169c13ba8 SHA-256: 65cdd3dd3100f7f095dadb31c43e7697530e24be4528266c143d6d9e90446c7d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to a news event. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=caso+de+ayotzinapa+resumen+pdf PDF link annotation
    • https://cdn.sqhk.co/fadejiweruw/PheKdha/download_solar_smash_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/haAUB6s/dr._kong_lubbock.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/i0hfgih/candy_bubble_studio_bubble_shooter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/jg9ghhj/52488105226.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/6hdkJjg/best_rally_game_xbox_one_x.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/190f72f8-7985-4c33-9301-d0286477dc16/an_american_childhood_by_annie_dillard.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_f0201ba691cd4f95adc7a8418a798a38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d8b6a1-72ce-472d-8d1c-e4458b839204/sigilixu.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_d98ec832fdd84c32aca60dd7ece0061a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/007d8bb8-b1ed-451b-846c-c238e2c979e2/lipix.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ce356401dc914fb3826ddc2c9e31495c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9971d6-a2e6-4c89-bea8-cc00a32023cc/what_type_of_charger_does_iphone_5_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bdd9cf-c2d3-4527-b853-d67c3cb60bf1/past_tense_in_spanish_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb2172e-db63-4139-a50f-80f7d9d24775/samsung_bd-j7500_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888e111b-2e22-47fa-8dab-61270356f5a0/aice_general_paper_discursive_prompts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56a538b-8c78-4401-9daf-d654c1f0ae7c/schauer_battery_charger_cr612_manual.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_229197e94dae49ddb97fee3120a44b9a.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_fe02553dcf3f478597fd9d0da9f4f6b9.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_980a4dd13cb94898aac055e39b1f22a8.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_810f34d0bc1a480eb2167ca5a8096af9.pdf?index=trueIn 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_off0001c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C57E 5212 bytes
SHA-256: 6053a6a5d2846c23bae86ff39bbdc0d1fa860b0c990fdff7c695b3841acb85f5
font_01_sfnt_off0001d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D731 12848 bytes
SHA-256: f05e461787f3732e8d871e519d15fefd9affcfcd3e9321a80b48ab3987237d26