Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f404478925096f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 12:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 860bacbc5d61f4dbbc6f1e66f3b86790 SHA-1: 632916e35917f755857578a87891422bc22e1f2c SHA-256: e8f404478925096f7a9b4083d08064b6a088ac49517554a1e053426f03abcd23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The high number of external URIs, many pointing to unknown domains and some associated with link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nezamirekhaseafoods.com/userfiles/file/24028450858.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06b763b8a---27102413348.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/degexamizugonozu.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/miwuzod.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/47177186884.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/83169540467.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/raxujejudepo.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vexofigupojiritigojuxev.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/kutagerameraravava.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/zelisikezozilokovir.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/poxekesopimuvudepuv.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/bemezenopijulaziliwefitix.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/70297463957.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/73903137915.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/44533436262.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tonatixuxokuf.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/3565864265.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd0e012bf---46565899985.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/90323746231.pdfIn PDF document text
    • https://archicakedesign.com/upload/file/1737505684.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/mosetin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bolly4u+hollywood+moviesPDF 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_off0000b900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB900 10548 bytes
SHA-256: 812def4be253378f985d6aa4e2c441d0601413e30a1e6c727caa35628aa2d70a
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16104 bytes
SHA-256: d3798b3859f494d9f29dbf0c08dcaf8eb7c791d2eea665f50c5cb4ba9bb49fe7