Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3d267a0c682ff…

MALICIOUS

PDF

95.1 KB Created: 2021-04-05 19:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31f9be7feb5b50926ee8066328c994ad SHA-1: de0251309cf293570b5ad24a7f8f861918d60f02 SHA-256: 78d3d267a0c682ff4ce02b5475cf4fbfec2020deb63efd31bbf728117125ac87
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though partially corrupted, suggests a lure related to a book synopsis to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=sinopsis+de+el+conde+de+montecristo+libro PDF link annotation
    • http://suwadebizon.mywebcommunity.org/33422059279.pdfIn PDF document text
    • http://susuwefusedev.iblogger.org/44246068417.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/class_12_biology_notes_cbse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_603ea6176f0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_602060395c524.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/Oja3msU/jodozozumijewujuzosimuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_6005c5a6d9e8e.pdfIn PDF document text
    • http://flipping-car.online/32363260017plltn.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/2008_ford_escape_4wd_mpgzfbud.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/hiajfhf/68643135249.pdfIn PDF document text
    • http://compte-cmbretagne.best/12108123130kahdr.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/ijbSjiH/58543473954.pdfIn PDF document text
    • http://erogan-encolumbia.site/11060937516z6lxl.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/41204651020.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/66265394676.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/hi5hdH0/bagudosexisojeditipitaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinezalidoratov.rf.gd/menezotavowuwaka.pdfIn PDF document text
    • http://lerosopuket.epizy.com/upsc_capf_assistant_commandant_syllabus.pdfIn PDF document text
    • http://fazatela.myartsonline.com/goxososota.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/easy_vegetarian_indian_recipes_for_lunch.pdfIn PDF document text
    • http://moxinipikilugu.rf.gd/blood_circulation_in_the_heart.pdfIn PDF document text
    • http://bitibidebizofu.epizy.com/diarrhea_guidelines.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/zevafapalojolowuzibu.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_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 5252 bytes
SHA-256: 901ff056de90f0cb99e671d64ba5074d46dfdce6ec072546acfe2dc935720ac8
font_01_sfnt_off00014512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14512 12916 bytes
SHA-256: 7bc808a565af67012d94af4a5c753bbbaaa231b92943f318393678bd2835bd16

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