Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a96b2a1822c8296…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 05:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 295c25b8c7918091d8d88f89910f7296 SHA-1: 7919320412af44ce5775b085bbc393939417d807 SHA-256: 3a96b2a1822c8296402ce6b2540d59ca8460417a7cd885c9e18285b1d3cc4f46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or redirection attempt. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports malicious intent, likely to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://micruts.org/userfiles/file/sufaxamago.pdf In PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/19713603535.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dalixud.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lametuxazulo.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jibugonefapanusajogixub.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/93016127907.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/41542174699.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31326798873.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26402854385.pdfIn PDF document text
    • https://pecintajp.com/contents/files/22501897819.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/demavisererubokoxusuloda.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/18578393273.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/93488443489.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/titozokinememewewak.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/68106239817.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210904002544.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/73045086776.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/96130555072.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/powot.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/26479738931.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/joretafere.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/48002810989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spider+man+apk+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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 10516 bytes
SHA-256: b60d55dbb8512c9906d7c75d2660503965235ba5ecfd480e5e4c44dbd9ce5596
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 20544 bytes
SHA-256: 573d03f87f18abafc2c0d6a918a1f9dcce464febea81facb8c1a0a00a7eb1600

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