Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea8e7a06fd1548…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 08:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 569d35709357925c249568c9adb3a28a SHA-1: c4bf969f9479a1bb4e2925c49a1a826cb5fc0836 SHA-256: 81ea8e7a06fd154802dae0269f56e540e4ff4a05ebed52bc1f2910332671869e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URIs, including one pointing to 'allytemp.ru', suggesting a redirection to a malicious site. The document's structure, being image-heavy with minimal text and a click-outward action, strongly indicates a phishing attempt designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=slam+dunk+mobile+ios PDF link annotation
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/98757081898.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/romuzibajopiresiragi.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/99009301788.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ximida.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zudogovokemiwobonud.pdfIn PDF document text
    • http://used-machinetools.ro/app/webroot/files/userfiles/files/85344893094.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/xitofuzolufenubevefepu.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/61964489021.pdfIn PDF document text
    • http://autovoda.ru/upload/files/janupukugakadofivufakofes.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c382d7eefd0bce754cfb32b436e8b913/25482541152.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/94748412838.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/4415343977.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/labakem.pdfIn PDF document text
    • https://sharenkon.com/files/vojofujar.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ruxabadeludifepobor.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/87388577934.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/8901869980.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jenaminipoposubokifepa.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/82192165952.pdfIn PDF document text
    • http://splogservice.ru/content/files/vumilikolab.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/bidakoki.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/41385012757.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140008078657.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/jafakojarinazuk.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109152312071121.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/lisetironazixa.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/loduridap.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 14332 bytes
SHA-256: c664ae464f6ea6b9c58c8d3821d7a6beac3979d54c36f84e59f83359b816261f
font_01_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 10616 bytes
SHA-256: 20c3e616bf7b70d690af785ed3387d7fe70f2c204cee480fa07d5d84714a66d3
font_02_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1