Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0274155c78b580…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 21:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1af2d701670ba8acef11044915d2b1e SHA-1: 56970d365e2252420e4d689e3a4672347b25a853 SHA-256: bf0274155c78b5809c883ba3e5db5fa033724c316d53f0c31c52c9a1e18d34bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of sites, likely for SEO poisoning or to distribute additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://trustarshida.co/cache/fck_files/file/37173552597.pdf In PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nabosezuluf.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/41007933419.pdfIn PDF document text
    • http://potya.com/43226334839.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/59629017139.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zukiwipakokibulajebe.pdfIn PDF document text
    • http://www.moyekolodin.com/files/farof.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/xazabebejesadanuvo.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/32832024455.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef460b2076---duxupotixagadogibotug.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/walakopatiwerezaxibi.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/titekemafevatemakefavuju.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/42963401569.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/sedidinugejebikuzixosud.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/57363509016.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gexubozenelixoj.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xebudusizutusir.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210907032814.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/tezijosugomikomenijo.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/3010433501.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904211556237108.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/jinikavonuv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3hsmrm7gvgg87j1ee11fitim96/lemudu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vixogevulodagejixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=alkaline+juice+recipes+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_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 17328 bytes
SHA-256: ff399c181444d130cc393f631ce3f3c6f31515dd8a84b25e7af3b6217c4288b9
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10696 bytes
SHA-256: 6674f8f1a95e5f9c14a509238a57887c1204c489c1230fc9b3b80d10755bc38a
font_02_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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