Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb92ff134a86873…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 02:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec421d986aedaac056cb5990d475b655 SHA-1: 333cb0bbb04295ed81ae644ffa525824f4233cc3 SHA-256: 7fb92ff134a868739362a5c058d37c61ca986bf5b7ddb954ff1873dbd82c36d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to host a large number of links, characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://mongolia-volkslift.com/uploads/files/vureza.pdf In PDF document text
    • https://aashianarealty.com/file/49641263473.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613711fb4440d---majoge.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/padaporizasigejiwi.pdfIn PDF document text
    • http://3asoft.vn/img/files/nevujexasus.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/77215718419.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-03-23-09-72.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210910054525517845ws67d56fsb9p.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/kevovewaxasujoxijiforep.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/13078792457.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109060845317951.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/dosasedegofikalusux.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/23568281336.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/wozadokufep.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/58303541703.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/gawovujuminibokunabeluj.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/guwegujitopexatosu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/memote.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/xezar.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75189496743.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/fubupizufogakimawodofiled.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zezoseweb.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/liboseremejokejefafina.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2629170a42a29cd693db4b072fbb8212/tilekolilobuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wwe+wr3d+2k20+mod+apk+downloadPDF 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 10780 bytes
SHA-256: e20c569100362e9552ccd03cdf0d2d34606848f7f6e91051c8c56d4860097af7
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 17048 bytes
SHA-256: faca44406ad114e6bce266b4cb42deff65d839bc36c5edb69b15424419c91fda
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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