Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f309d0d063711b…

MALICIOUS

PDF

116.1 KB Created: 2021-04-08 02:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96522df3ec086e25d2d814c62b8fb718 SHA-1: de1cfffa7bf4e6989f7fc90bd944a538bbca42e7 SHA-256: 42f309d0d063711b4636555ddae69e09d75494999ff10ef932f71d9c2d6b0774
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://soxebez.ru/123?utm_term=accentuate+the+negative+investigation+2.+3+answers', identified as a potential phishing lure. The PDF structure also suggests it functions as a link farm, aiming to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=accentuate+the+negative+investigation+2.+3+answers PDF link annotation
    • http://fogozuvonuw.66ghz.com/approachers_series_economics_for_shs.pdfIn PDF document text
    • http://laposedofijusi.iblogger.org/burogin.pdfIn PDF document text
    • http://biteroz.iblogger.org/boondocks_all_seasons_free.pdfIn PDF document text
    • http://lovechat24.club/71083217095g9t4u.pdfIn PDF document text
    • http://passive-income.ru/navozozurinoloverosisawon8wswn.pdfIn PDF document text
    • http://impergamon.com/xixupoxijatogabamavapofje7sn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maderenefozido.rf.gd/email_etiquette_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/braun_tribute_collection_food_processor_manual.pdfIn PDF document text
    • http://danofef.rf.gd/integral_calculus_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/trane_rthc_chiller_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/15862815799.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_35d174db4f01400aa763d026d469444d.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_cd20710b2ef34ced83bd64ef2714ce05.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_742f44091eb94808b215d955d4a0d20c.pdf?index=trueIn PDF document text
    • http://desorebo.epizy.com/will_there_be_a_solar_eclipse_in_2020.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_a32257958b6c4550a852103ab5c54281.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_off0001889b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1889B 5496 bytes
SHA-256: 1dd20923542ff3ad95954577887c6532450f4d18864713ec46cfbceb2848d6c5
font_01_sfnt_off00019b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B6A 12140 bytes
SHA-256: 72b276d5d4583272408865aef0dba02ff933acb17034d97b9dd9b4f50ee8b53c

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