Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee3edda1a7945c6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 14:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85ebc351b5a239cc6a5b5e21e77bd75e SHA-1: 050b9b246f47617f6de4f27646cd27a9e047efe3 SHA-256: 5ee3edda1a7945c6e155459aff08484fc3fb3f063df99c04776e60a7ec14fc3d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick users into downloading a password-protected payload, likely to evade gateway scanning. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=disable+pin+on+android PDF link annotation
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zilemejonoxekojetaju.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/68211021546.pdfIn PDF document text
    • http://njchemland.com/upload/files/74199728301.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/37360202933.pdfIn PDF document text
    • http://bubb.cn/up_file/file/diberudububixeziwozes.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/poralufikuzekuzejikus.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/ginekunuzorun.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/3798518592.pdfIn PDF document text
    • https://loyd.rs/images/file/25117287719.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/gaxuxilo.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/guwex.pdfIn PDF document text
    • https://cmf8.ir/data/file/21673506898.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/9694367177.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/voles.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-8/20210908013039990396.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/55937982942.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/21335885636.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/82820681871.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/22884472683.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/33727857288.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431ba30edf0---86621527854.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/jumafegitewipulevudifumer.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/lasabekawejenuzopudowe.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 18028 bytes
SHA-256: 52dd4e43867fa735b0c22c4c837991ab53773c46a17efe071be14334725f8b96
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 10428 bytes
SHA-256: 6440da9a9553bd265612a83650087d0260d5cad4f15c86150a067cc12eff3045