Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0a370b4afcbde3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 356d65ea2b0ebc9bcbb5ad3f654bc00e SHA-1: ce022a97629e0da6ec2d38cc4b682f56711f2379 SHA-256: de0a370b4afcbde3a1c312c33350d9bfd7df57a99a188fb0d57381d4d2cb896a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=redmi+note+8+system+update PDF link annotation
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/33711058444.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/46688000853.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/75618063840.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/kugatamu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109180017597059.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/zoxenibiteputamu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/29880597367.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3e0aa7923be652ba5bfba6171d944df3/49099546331.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/5328566043.pdfIn PDF document text
    • http://billsky.ee/files/file/69459771120.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/dofisam.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/worovivoselagidewifebu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/zosudewisimaxenuse.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/40870085837.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/lidavaluzopumopuviga.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/46584805141.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/6304141166.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/xelekavikisub.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/85648326987.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/45511791402.pdfIn PDF document text
    • http://acelybio.com/upload/files/suvotabimotule.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/falodewalejafizisixiriron.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/faduluronikuwubanewovit.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10876 bytes
SHA-256: d8cf1e67ce3b7be5596f3cf75aadbc9003e58e6f9531c46fef57f21acd6ddefa
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 18056 bytes
SHA-256: e32b3705f762dadd5449e24b1961ced8d3a45f073e484aed83b5fb5124dcb2ac

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