Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0d90380ca215d…

MALICIOUS

PDF

86.1 KB Created: 2021-05-11 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 067fae48f398320109ab32127de0f30c SHA-1: d13c502bc53cf3a194107cffe846ae0e7e07efd5 SHA-256: e1f0d90380ca215d5630588bcdcc0e9b54802dc517dbd81bc06ffae8dd7bca59
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=analisis+y+dise%25C3%25B1o+de+sistemas+de+informacion+ejemplos PDF link annotation
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6034d8fe956dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_602ee4b3a7372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5fec8f4343adc.pdfIn PDF document text
    • http://coloradocustomelectric.com/dixaroxodifiremani31m6d.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/dividing_decimals_worksheet_math_aids6wao6.pdfIn PDF document text
    • http://prodit.space/vopulobavavinudume71isn.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/dolakepenodifirety986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_603abebaa1cdd.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/11335728943.pdfIn PDF document text
    • http://kexawez.mygamesonline.org/33250561831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_603461211793c.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/rejukided.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_605d72fd0a8aa.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/49ef1dd7-bbdd-4f4b-a08a-f3cccaee1c64/cmo_hacer_una_corona_de_adviento_con_material_reciclable.pdfIn PDF document text
    • http://mutodilevo.epizy.com/chicago_fire_season_3_episode_11.pdfIn PDF document text
    • http://lejovoxi.epizy.com/nukowepugofidufiwixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fdb153-b63b-42a4-8795-06a7aad24fd9/apc_es_550_beeping_4_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f0afad-9d73-4e70-a237-87ae136e7249/94059555304.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_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 5680 bytes
SHA-256: 5351ffcf6f6bfdd63cfa2e76f9bd9f2dbb941ca59d1beb03f5833e1f908409ce
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 12676 bytes
SHA-256: 3156bd1e66ad71adc7e9fa2c60cc37381be3c0d909310739f1356244b117597b

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