Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8546354c9dc643…

MALICIOUS

PDF

68.4 KB Created: 2021-09-10 22:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 742847de67701be3f6643bfb739bf4f0 SHA-1: 865052db0a84ccbfc1851c26fe4cb7aeb044ff51 SHA-256: 8e8546354c9dc64370b379b3c6d2b0b481e333c64f3754b1a029989c1be4928a
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document structure suggests it's an image-based lure designed to trick users into clicking external links, likely for phishing or to download further malicious content. The presence of numerous external URIs, many on disposable domains, reinforces the phishing and link-farming nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/86075749338.pdf In PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902111953.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zajilusebavasetof.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613204e6a4288---fukotitemanokir.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/newuguradamelafekikevagi.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/87126089694.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/32221944188.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/dozuwiba.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/xamadow.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021941157135133.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/xuzimawanojefi.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/96010390347.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905191020712953.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/xuxugulujonexu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/ronupametaliso.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/rafebogevorodufumakawaba.pdfIn PDF document text
    • https://ntc-container.com/upload/files/zogewerak.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/zosafofib.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/76835611230.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/18083585869.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nibegisotilubodolamabuse.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/46322023086.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/4333935686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=need+for+speed+most+wanted+apk+obb+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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 14152 bytes
SHA-256: 6a8144a54baf3dae3c357170b00c504bac531fcab5473b3a08fc6e45a8dec159
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 10864 bytes
SHA-256: 2c938b30938c542c4e453f3a318a4ebe7770eca39485427f381768f7899b3f03
font_02_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1