Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c723cab6bac66f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 12:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3162053e02c1b157d90b49ec091e698 SHA-1: 9bdc7cccdd9fdac2a2835dc02351dd656639aa9f SHA-256: 46c723cab6bac66fae7b91588b8cbef99f6e2bca57e6c92809e5d8a0d09678a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of urgency lures in the document body further supports a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML/AV detections indicate a high likelihood of malicious intent, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://novitas.ro/files/fetakojodupi.pdf In PDF document text
    • http://ekvatorbl.com/userfiles/file/pugoninoduguziwive.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/11242898775.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59796312273.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/negejanuwogetuzugibixotu.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/82327950797.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/dofanolevazuvexifus.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/767eda28071a1f766a8b397cd829488c/46826918977.pdfIn PDF document text
    • https://alev.az/userfiles/file/82275271429.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a63e3c7338667443813f994f30a2688/50223269036.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vitatoludawuxusumarufuvog.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/23966585702.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/92127587803.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/44866963215.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/52613325690.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/26961587947.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/97645462676.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/zoluvinobadigozetelebutek.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/bimixel.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tinakobuzesuxelaramib.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210902file///sapozusupifixarufevasedo.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/bedevupuvota.pdfIn PDF document text
    • http://epmachine.ru/d/files/21374238378.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/babebiwuwatarinarakogixop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+wwe+all+stars+for+androidPDF link annotation
    • 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 17920 bytes
SHA-256: 6fd129a0175dfcce7b9f5ea1dca5fd09c1082d40e69d2d2bb1f23af67cccdc38
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10432 bytes
SHA-256: 5531edd1daac8dcfb44d3571cfbc568d836eecf3248bef31ab2ab8b395672dcb
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1