Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d58b5dfb8f84add…

MALICIOUS

PDF

87.5 KB Created: 2021-03-24 04:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 96a5bbc9c6caf4ad9edf0e5ef0953e3c SHA-1: 77ced47dcc0495d1ad56661e1d1c4f3cfcbf7540 SHA-256: 3d58b5dfb8f84add13464646e1f3fd3cc026a86ef66381a2f6dacd17ba547b02
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to 'current affairs' and 'pdf', suggesting a lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=affairs+cloud+current+affairs+june+2020+pdf In PDF document text
    • http://instofficial.online/57098577155z21br.pdfIn PDF document text
    • http://xejiwov.iblogger.org/7161276796.pdfIn PDF document text
    • http://unityfree.xyz/womapalotuninikuraxikunj31xy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_e8377417666a42f0b5bdf48a61dab5cf.pdf?index=trueIn PDF document text
    • http://zumebixakefeta.epizy.com/stores_that_will_give_you_free_stuff_on_your_birthday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcb6449-1fdc-42f6-9a82-4687e0d40635/61165409453.pdfIn PDF document text
    • http://mowilutom.epizy.com/apa_format_reference_generator.pdfIn PDF document text
    • http://pevemixakenasob.rf.gd/which_multivariate_analysis_to_use.pdfIn PDF document text
    • http://tapeperogu.rf.gd/zipuzetomisiwulemosi.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_3bcde213809f49be94d166b9fd4ef8f9.pdf?index=trueIn PDF document text
    • http://fotubolore.epizy.com/paradise_lost_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98cdded-988f-459a-918e-1a46ffdf055a/xenumosilinu.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_183f5587c3f84d818bedb7554314770a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0759abc-785b-4aad-ac2c-e4241aaa38c2/interior_design_salary_uk_2019.pdfIn PDF document text
    • http://xikepilapap.rf.gd/206657231.pdfIn PDF document text
    • http://murunujerumax.rf.gd/honeywell_building_automation_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933968da-fdc9-4e75-b99b-b31deabec698/sims_3_expansion_packs_steam_to_origin.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_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 5488 bytes
SHA-256: 7df8f566c5565f2e1340c50e23fa2a376678f5dd7fe11b2235ef8dbd7e28c40d
font_01_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 12328 bytes
SHA-256: 8e14dba119fa1e7282de446d58a0d7eea8bbab7f3631778f341aaf7664219697

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