Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6c4bb5bb93892…

MALICIOUS

PDF

77.5 KB Created: 2021-04-15 18:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f84c15edcabd5de56a1b46430691dbc9 SHA-1: 17f0675cea38e00eda52ea445c412d52ca454a09 SHA-256: 31c6c4bb5bb93892be7010446963141575b789c1f5e17e8db988e809aead52d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically identified as a phishing lure related to car batteries. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site for credential harvesting or other malicious activities. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=what+size+battery+for+2004+toyota+corolla PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fdbd9913222f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6019719b6c0fe.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/gawisogiw.pdfIn PDF document text
    • http://lujedovijoluje.22web.org/88315230499.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/liwasu.pdfIn PDF document text
    • http://xelirap.22web.org/rental_agreement_word_doc_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_6043faf661c37.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/borutofafubulukifinirubov.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/NhjborX/19649562525.pdfIn PDF document text
    • https://cdn.sqhk.co/winanuwumovu/31WE8he/pivufizerifugiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/xapanularopu/ibhbw5u/simasalezesajetap.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/papafujutekeweg.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/hjgcibG/wixaxovapinetegavo.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/automobile_repair_and_maintenance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_95ffd16307ca4fd68ab4a596649c13d9.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_8cd9839cfc5e445e8f0760d790ad9bba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzamada/mematebolefebudurenewazi.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_ed0600961f684ab78df34ce5a051ebe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/vafemoneketufel.pdfIn PDF document text
    • http://nufitexevav.rf.gd/android_disable_apps_running_in_background.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_9aef769e06734f25bee279078d60e73e.pdf?index=trueIn PDF document text
    • http://manatezolixoguz.epizy.com/pajakefamijina.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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 5636 bytes
SHA-256: af68c757f5e82ba51b1d7f51aea3a6702252eaa9f8f44029d6c8c1673ae6bab2
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10944 bytes
SHA-256: d9896213b08065b8f9471bdaa7af95cf56a397b6ac2ba5a10bda52cb596c09ec

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