Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bf7f399afafcc0…

MALICIOUS

PDF

90.7 KB Created: 2021-10-16 09:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae46247ef3f4a058e988b2241a994a38 SHA-1: 57520f028180cdf7cdc5b3fa602e20efc0f86f4f SHA-256: 65bf7f399afafcc03e7278cad42990bccbdf676d81e89a9e226713978c922428
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://civilkontroll.hu/uploads/file/zaxutujupiniwukojidij.pdf In PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/mexukasewopunatukofudomuw.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/71754538431.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/78977246401.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/gazelufapiko.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/18711694450.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/larajegibikezudo.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/21536796690.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/85361695624.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/75784972954.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/81196446846.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pumepazuribo.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/28118448670.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/xunotiz.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/89623413645.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/tobozupumelejegumodorowob.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/189102ae5d68d12cf614545486d5a3e1/bawavekugowirax.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/zapifuxelenawitutugefabol.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/vivatunudisawadudonajobof.pdfIn PDF document text
    • http://nineslash.com/user_file/file/lefoxibajojofeme.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/25422087723.pdfIn PDF document text
    • http://platcometals.com/images/file/70175474823.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/gezomuvedi.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/22700034256.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/mejewenimoxamuzaxenex.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/98649890813.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=balanced+equation+for+the+complete+combustion+of+ethanolPDF 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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 20556 bytes
SHA-256: 7149b71ca03419d6396f7511fb62433385f0ad9834bab4d83d679476a7531fe8
font_02_sfnt_off0001424e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424E 11324 bytes
SHA-256: df86de5437fd4d6420674e865185469bc2149bec2c168cf1cbf5179082b625a6