Malicious PDF — malware analysis report

Static analysis result for SHA-256 33840b5249dc7ce8…

MALICIOUS

PDF

71.0 KB Created: 2021-04-10 02:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 438b78cb900e9ec2e9553fb4e9500b15 SHA-1: 50abb7ffa77d26cae9d98a899cbcdc20ecdb7e06 SHA-256: 33840b5249dc7ce836ddb914a6ec57a850fbd0c3a92aba87d8d15db32f0c1e55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 multiple embedded URLs, with one specifically pointing to a site that appears to be a link farm designed to redirect users, likely for phishing or malware distribution. The document body, though truncated and obfuscated, contains keywords related to device installation, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+install+sd+card+on+galaxy+tab+a PDF link annotation
    • http://useporte.xyz/alimentos_que_contienen_flavonoidesiad5b.pdfIn PDF document text
    • http://farvestnn.ru/upsc_csat_question_paper_with_answersg2wnu.pdfIn PDF document text
    • http://canonsburglake.com/types_of_gears_and_their_usesbqqs2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5ffba78e5779b.pdfIn PDF document text
    • http://scoretdho.best/xafezupitzj92n.pdfIn PDF document text
    • http://afracheat4.xyz/kesewexewupedosoz1yuz6.pdfIn PDF document text
    • http://casser.xyz/34228815399badlc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fcc8cced033b.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/1e6f5d25-ffc1-4b92-952c-97a9156098b9/43596070705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32084c54-8cb1-4d4a-a8ab-18b213c79b0b/modernist_cuisine_art_gallery_seattle.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_e7e43101193f469aac2f1eca31de1dec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/fanon_wretched_of_the_earth_summary.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_9a792624009f478d8180ca680744fbf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/pawexilafaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/39881192869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5a7a24-f204-41e4-9126-6b11c8ad6b75/ninejumol.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_c3d5102df5ad4bc7857dfc4a017f47cc.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 5468 bytes
SHA-256: 63959d6d7c3c51f44af2298859854ac35b4a637fdb8dbb6fe13dcc6c378ebe59
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 10812 bytes
SHA-256: 699477c852362abba4de2a66f49935034d73fcf8210547fec18bd6393b298062

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