Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b652e939cb2199…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 05:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 137620e739ca39aefcc4af259da62f77 SHA-1: 62a35542b5004688298e313aaf5c500e2749b02b SHA-256: 39b652e939cb2199f2cbe9aeb63f175e01e293543cf6cb968483eb2a974570ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing lure designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://restokrat.info/userfiles/file/xexamerevo.pdf In PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/2188879467.pdfIn PDF document text
    • https://kawanmto.info/contents/files/52249225044.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/15420047083.pdfIn PDF document text
    • http://giga.sk/storage/file/jopenavoko.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8ebdgfbvl20qc2dru68dj2pqok/xupibaxozikuvatanovuzibij.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/66396518194.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/53004385388.pdfIn PDF document text
    • https://dafelia.com/files/vewebitekofox.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910050730.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5116bf8516069309abb8ff2735d9d1d6/47937504542.pdfIn PDF document text
    • https://alev.az/userfiles/file/82119446969.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/79082329376.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/womipoludodevozamijitowom.pdfIn PDF document text
    • https://ocw.tw/uploads/files/37649305633.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nobilizetuwetis.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/3743358605.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210903091701103.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/61020385776.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/36618707095.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/semazepev.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/19724840162.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/segikekawuwisevokuxo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/segewixugigavetenebozi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sikosaxesofoxizubawoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=my+android+phone+is+locked+and+i+forgot+the+passwordPDF 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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 18016 bytes
SHA-256: f6f10b44ac2d172ab2ab38c6205473df9156195af506bc1b495d6f92772da964
font_02_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 11184 bytes
SHA-256: 8ce5f802244940a13cdacc3da08029cee04db08820a57767428f008bfc237a44