Malicious PDF — malware analysis report

Static analysis result for SHA-256 029ebb93f3a5c701…

MALICIOUS

PDF

119.4 KB Created: 2021-09-16 20:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a813169224a0ec84be5df6f35e92ac5 SHA-1: b1c2d8e6c371ff4930d0e35930ba5e01b4229424 SHA-256: 029ebb93f3a5c701e47627bdb850432bc395ea2cb8df2692b3bde350067dd0c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the nature of the PDF heuristics suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://coretry.ru/uplcv?utm_term=android+mobile+processor+ranking PDF link annotation
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/30725108629.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/97756090361.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_4A8BE2845100C716.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9a6b5025394145f10a2d6db46015f2ea/xuziv.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/44486863965.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/rudiwe.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • https://badrivishal.com/media/4266365482.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/jizufaxuwe.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/gasepuvudagumaje.pdfIn PDF document text
    • http://email-database.info/userfiles/file/67506398809.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/4270372888.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/jiwixopaposoginedo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mozigutolowunexunapeluzu.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xunufusabanos.pdfIn PDF document text
    • http://www.puhito.hu/uploads/38841915065.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f62006f2d0---30679547681.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pemibabopezutarerox.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/nokenoxenerikodavamus.pdfIn PDF document text
    • http://feminella.ro/upload/fck/webipekilin.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/57734526384.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/77519520147.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/tikatipipijitavotijapir.pdfIn PDF document text
    • 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_off000171b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B5 17048 bytes
SHA-256: 682c7de18342e4b52489677678a31d5df496dc349c7d285a3f34079e7f3615c3
font_01_sfnt_off00019e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1E 10972 bytes
SHA-256: d10b2334d14a2cd3b88fe899f76418279c5231e60119ef601d0f72c45a885818
font_02_sfnt_off0001b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1