Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a439ddc71def34…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 11:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ce76600a386e376e0f2bbdd83f575f9 SHA-1: 6e22d2a3bd2b212847004e80a6dceb160ed1c327 SHA-256: a8a439ddc71def348ef35c7ad4e81c7b72072a1acf49fea22e4d69b4822e0fa5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious PDF for further exploitation or credential harvesting. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://medeeatour.ro/mm/file/tofapazugixu.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/joluvami.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/33458850584.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/sezuduzulilag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/boxowofazamebaz.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/pixepugosavoral.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/51378546205.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/66476027947.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/zufurilopi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ade9c572905ee2c6ab24b7e11a4253bc/pogowiruviporananozonixe.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/11310248299.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/43862009980.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/sekezasanosaginajasifafiz.pdfIn PDF document text
    • https://schmitz.cz/res/file/simed.pdfIn PDF document text
    • http://corkpotters.com/images/velexabugibesi.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/kawufoxilosilunixovu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/81388942240.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142b85fbe8fe---53999753285.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/60320938292.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vigewopare.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/witejuwibagubemubope.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/96148846258.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/fiwoxajirun.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mifab.pdfIn PDF document text
    • http://klinok-saintp.ru/files/libowozufezubabogo.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/47003512497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jack+canfield+law+of+attraction+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_off0000b40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 10612 bytes
SHA-256: 532b91badf19632a390b39e8c240633a49f651645cb58e4ce07a1bb106405acb
font_02_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16392 bytes
SHA-256: f4fc3a1b0fdb4ca82714a45fdcb9fd7186919badd8463eb6181f1465fe1397db