Malicious PDF — malware analysis report

Static analysis result for SHA-256 487d3ca3e8d56173…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 03:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 223c176f332c1814c9b54b4a602a6721 SHA-1: c2b085e4441162bf90c26dbfc2ae05f96798b0f0 SHA-256: 487d3ca3e8d5617347944d8db08c1cb158c5ed857027c192bb960289855c059e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on potentially untrustworthy hosts, suggesting a lure to external malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://riviera.az/userfiles/file/rumagiz.pdf In PDF document text
    • http://rollfactorytogo.com/uploads/files/dilegusapod.pdfIn PDF document text
    • http://potlista.com/file/files/91715216992.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/76560552916.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dokavunevebugitizipig.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091104001970.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/70648426463.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wexikugogavowufabubi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/70981195593.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vawazasezokebo.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/lajutetejatesemawakuba.pdfIn PDF document text
    • http://servmed.net/userfiles/file/borejawijano.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qad0n4iv25h56tk20h4nvdajpc/bewigi.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/zowarijulipawuwilal.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/44120400610.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/lofimid.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/bepuxakewowekew.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/fobigijakakepipatekuni.pdfIn PDF document text
    • http://zubrcup.by/files/files/xajajazon.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dowolajibapowo.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/wezatutovudajoxoxegodiwov.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rorare.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/67496958530.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/zabafuzatobokutar.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2b45065394e3da7529dec46c5250c25e/kuwemudim.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/74155733958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aravinda+sametha+full+movie+download+movierulzPDF 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 17692 bytes
SHA-256: 87a6f0d7e3ba680ce9a25a9b98140a3bb480920d3337386ea5f64a09bbdafbed
font_02_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10912 bytes
SHA-256: ef7f190400016d036d76d55e175a3d636fc799b546e363c898582ecb63733f30