Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a0aeedc83d3aa2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 08:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2dd93e641bc7257551708646b633b0bf SHA-1: edf747330ff67562f2bf903a02f69038592d7430 SHA-256: 09a0aeedc83d3aa2c45261493d0bec6299e02076cbe7f0838cde7268bd3fec9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users through multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=naruto+shippuden+ep+362 PDF link annotation
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/49592641520.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/91100342815.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xuvalagivirajusofi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6a54c8cdf3694755fa4903a6519a5000/22016982960.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/10570285329.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/poxonutirexabokojekix.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/bizidukotobu.pdfIn PDF document text
    • http://zaiger.ru/img/file/zagunesekafefoso.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/71285913647.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/kiwipubedilizevamuz.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/severaguderopubup.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/42971115783.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/80106497323.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/31990389426.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/44881849511.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/81876211739.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/wuduzudonunivisopazutu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613784278349c---94438560554.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/62843057625.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25771156932.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/puses.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jobakokeburiladunekase.pdfIn PDF document text
    • http://www.anime4you.com/watch/naruto-shippuden-episode-362.htmlIn 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_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 21248 bytes
SHA-256: 9b1c21e8e6e6e0b2da05215ce08736d4dbe1b2e6c18f7cf246cdcf82a0844d51
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10980 bytes
SHA-256: ad3e3ed7bc33fa4153d38c0e6eb4082a5cc9b2fc53790b685a00d1d52492739e

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