Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ab8b5389aaa521…

MALICIOUS

PDF

69.7 KB Created: 2021-01-01 13:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0502e7c437e45f8fc4556a926c62d46c SHA-1: d452fe61014cf7749c445fb136d93fa48e3b5f51 SHA-256: 50ab8b5389aaa521edcf102311b6e43bcbdd4ea37640c05909cd0f7c9cf1ef6b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure, possibly related to educational material, to encourage link clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffking.ru/123?utm_term=general+chemistry+review+worksheet PDF link annotation
    • https://gitesadikelipa.weebly.com/uploads/1/3/0/7/130776331/redeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5fc4744269c88.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/1181728.pdfIn PDF document text
    • https://diwefiramogepot.weebly.com/uploads/1/3/4/2/134265367/2080332.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/DIjjMic/squad_vs_zombies_game_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_5fbc6e258775a.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/AwxFigQ/ferojuduraneredojo.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/lomutiweji-detozufuvus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f874a4f8527b.pdfIn PDF document text
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/fisiwenud_niziw.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/62785a5d-6928-4423-940b-74c60aaa1b52/tuwexipiluna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b926b97d-30db-4a79-9d1e-39e19b31d7b1/the_testing_chapter_19_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f88ed99-50d2-46d9-8340-e83248f08bf0/7047256209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698778b8-3b50-4def-b2bc-2f09d20468e7/prison_life_exploits.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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 5388 bytes
SHA-256: ea57d9696cbef7070b0ca46ad7fea088dd25aaf90ac4dd2a16ce1fd83b064193
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10376 bytes
SHA-256: 54ab55310fdc1e2cca5a59db8ac71c3ba3193a39b1aed7f8227cb54bde031c3d

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