Malicious PDF — malware analysis report

Static analysis result for SHA-256 63840fa1ba61a576…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 19:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 849e0617df2e864d597cb2ecef97a273 SHA-1: 10e65178e146cdcf44de3d7f9f6f72051ddfca02 SHA-256: 63840fa1ba61a576034d3929997dd45c155f8599280a5b522ef34eccb6a122e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a 'link farm' pattern on disposable hosting, suggesting a phishing or redirection scheme. The PDF_URI heuristic also points to external URIs, reinforcing the idea that the document's primary purpose is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://coachhouse.info/assets/file/vizopal.pdf In PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/80567699471.pdfIn PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/vevabijumegozataka.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/dijibebusup.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/28590839067.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/pixiw.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/24690668464.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/rufiwebatamupikoxibukex.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/32388230261.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/56703476039.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xejus.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631689417417616193.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef74cbc2e9---62403658534.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/53199981965.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pezukafi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/gatem.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/21723881500.pdfIn PDF document text
    • http://pmke.cz/pictures/files/juwamowo.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/difexi.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/bexubawurejotaluf.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/60548591327.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tafeforuvovewamado.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/likodefop.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/fubizedasew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shattered+gates+of+slaughtergarde+pdfPDF 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_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 18592 bytes
SHA-256: 0106bc1ff0e82970ede5608fd4b844c01c4fe1775ab203dbe16ed585429a89ed
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 10756 bytes
SHA-256: 453654e3dd80b23130be5e0a1e99588061d62ceddde218a30d1c1484ab5397e4