Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e38d20f54370abf…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d81737e960cc7bb7a76297280ffd858 SHA-1: 3748cbf7d44d4d334f59f0e5304f995249556f14 SHA-256: 2e38d20f54370abf6ef0d579698adfeacdeacf6689182d944f140134c1fcf176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=free+watch+drama PDF link annotation
    • http://www.hussco-steel.com/husscofiles/files/taborisizigeme.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/voxiginoxepozaretug.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bawopudixig.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/960986698a30a9170c8eddc5a668b277/devatijija.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/jadulunago.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/wonibitirevobogoj.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bomuvurebol.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/43250832681.pdfIn PDF document text
    • http://moneymaker-gold.de/files/zoneditan.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/22203827928.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/80609178168.pdfIn PDF document text
    • https://tsegypt.com/file/45579272220.pdfIn PDF document text
    • http://snft.ro/media/file/venanaxepovasozosimeji.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96494532495.pdfIn PDF document text
    • http://parentini.it/userfiles/files/20558185752.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/rizibaliwule.pdfIn PDF document text
    • https://seger.cz/userfiles/file/32311412884.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/42245880510.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/sodowobijenosore.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/75677980538.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/jezizumavozejosinuju.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_off0000b239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 16072 bytes
SHA-256: 83f1a3c401542a5c07b85986675dd4296b1a806c52205657036682d9b0891b16
font_01_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10168 bytes
SHA-256: 4eaae7d1280704858af2935aee54261cb463b26bee07ad3365d5197163cb236d
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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