Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efcf4feed36ee1f…

MALICIOUS

PDF

86.7 KB Created: 2021-04-06 00:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9b5d1109867ce008530e29119d08a8a4 SHA-1: ca443a10c600baa7c9b5ad9ad78d5e86dfd9cdb6 SHA-256: 1efcf4feed36ee1f6ea953449a80e93433df3bd953cf088719abf0f42d5815a5
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick users into installing potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/wix?keyword=magnavox+zv457mg9+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6040e80ec40d7.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/air_fryer_recipes_for_frozen_pork_chops.pdfIn PDF document text
    • https://rusuxizebagujam.weebly.com/uploads/1/3/5/3/135302265/336baf29af9531.pdfIn PDF document text
    • http://hookup756.fun/how_to_fix_samsung_fridge_fan_noisev06u1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_603fa1a5aace0.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/zamexeba.pdfIn PDF document text
    • https://kaxepiset.weebly.com/uploads/1/3/2/7/132740291/2d9a2ea6c3e.pdfIn PDF document text
    • http://profibrend.ru/weber_spirit_e_210_oder_e310ie3r2.pdfIn PDF document text
    • http://xogakijukutikep.22web.org/kisiretorulirowit.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/buzedajuzoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fc76f0fcbfc8.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/aprendizajes_clave_secundaria_ciencias.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_6033489e1a665.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/56323050855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6030442296f06.pdfIn PDF document text
    • http://fetizona.iblogger.org/11974479055.pdfIn PDF document text
    • http://mnogoturov.com/weber_charcoal_grill_cooking_guideb911t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_8efae135b10c4039b378aad79178b683.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_6242a5dde8bf4b1ab8349a9b9a648308.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/nascla_contractors_guide_tennessee.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_8314f5d40fe54ec4952b7aad5c76de95.pdf?index=trueIn PDF document text
    • http://napezidemilolez.epizy.com/85988655160.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 5552 bytes
SHA-256: 1f643fcefae83f5febd5411765d11caeefef12173feea3a09345b2080ad53100
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 11332 bytes
SHA-256: ef90e0de7a3f528f938cb570892357dda8fad05afddfb83c517661276c7d89db
font_02_sfnt_off00013eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361