Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee648bb2b9afa4ef…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 00:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e90a7ee248a8b3e6397f60d61310535d SHA-1: 1838608b3f85cd8f781b5ac13ad1bcc953053b08 SHA-256: ee648bb2b9afa4ef2c722e148d9f9645a822e18e65cc07892dba21e9b72ac624
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of urgency lures suggest a phishing or credential harvesting attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=x96+mini+firmware+update PDF link annotation
    • http://messtores.ca/fck_user_files/file/62229957521.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zisokugagumedefixavolobov.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/91207377735.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/wekamokilenuwaxamonekevog.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vinigavo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/24617334649.pdfIn PDF document text
    • https://actorconseil.com/files/file/punutatobogepuneneleri.pdfIn PDF document text
    • http://renknh.com/ckupload/files/37247416812.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/36329854005.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/xiveguwudulaz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131121593cfe---48009546429.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/16581556255.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/didikiwerinovumodadasov.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/kurevufifiraso.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/kipasetebufiluxowop.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/lanuzaxavut.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905054519.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/70376296534.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/76983995143.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/77511992641.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/monowebizisusuzujosav.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade69c38e---92479957469.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn 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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 18200 bytes
SHA-256: a5818ce14b162fc0da0d340fdd1e4f090ebd4fe44e0c55ab87ceac0a5c05d455
font_02_sfnt_off00013a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 10852 bytes
SHA-256: cb73acf800000c75797ce5aac8a68584bb075cb603270b08bd424b5310cd0b23