Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a284837dd6af3e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 07:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbe1fef92cbc0fe4a7e51f791c8ccca0 SHA-1: fb1ec66e9776b5d298e752cc0b6135d964809052 SHA-256: d4a284837dd6af3ea1a64d63bd217cbfeb6321d11c4dcb1ddd8a4b8a5e04d452
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://gotoippc.com/ckfinder/userfiles/files/lujod.pdf In PDF document text
    • http://dglytbt.com/upfolder/e/files/20210911124838.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fofibinizozul.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/57912977793.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/27d8c67d6829936d012accfb1854eb0c/48703027691.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/nakixo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/49161037215.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dasuvedidejojevaf.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/nijeguzefemof.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/65128679381.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/63329372807.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/weritoxabevedigozozaxet.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/65879358248.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/badasuguzosunex.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/19686281048.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/84496334652.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/61417312612.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wimexodatozosipotuwemew.pdfIn PDF document text
    • https://coil.hk/upload/files/81100761050.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/90501748314.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/jefuxamaxirera.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a206ee73b8296313341ce21df072aacd/93236938753.pdfIn PDF document text
    • https://okazionche.com/files/bodonifati.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/77668327070.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/wizoxisilafoje.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/10837177396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+corrupted+recoveryPDF 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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 16524 bytes
SHA-256: f8eadb3746aa24a0531041c611bd72da358430a1b38638f41a417a2edc5a9ebb
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10392 bytes
SHA-256: c49b4688adac82b45951616c456e98b226bab1a77d11e31d8cfdf130b3653396