Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a2eea6282f702…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 22:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4da309b36613180d46e52c6b6233bcca SHA-1: f078c22411b314bdda36d5ab03460afdc94bee85 SHA-256: 995a2eea6282f7022e1a2135755ffb3079a817af200d9d276e59105c2ffdfab9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of multiple external URIs points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=watch+tamil+movies+online PDF link annotation
    • http://keemunblacktea.cn/uploads/file/112115247491.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/78071219669.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109020817558789.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/17508695717.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nanusesukotigatebinigub.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/72613370595.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xigef.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60041231911.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/welofubibujowasaj.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38075636978.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/16753675794.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/guleb.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912171816606442.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/83675853348.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/58851140960.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/74210263481.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/32810186881.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/relabivegilovilodefe.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/warebizuwudu.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/91153258513.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7f5ea754---32309610180.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161363dab72a49---8053791027.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_off0000bfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 10452 bytes
SHA-256: 9f0348f65a24eee8227f9de24af91c3064a55edbaa3825fdb9316fe3f5e2610c
font_01_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 17768 bytes
SHA-256: c9b0717a86a47a9fc632ff50e40b17a430812bf34f979a3b562e27413d50bfea
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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