Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddcffb173a889ad…

MALICIOUS

PDF

126.2 KB Created: 2021-05-07 21:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a2258dbb8cad4c44d79dcb1beda0237a SHA-1: 937e5df4fb5ba29834a9ec65b8b559ee5f2cebb7 SHA-256: 4ddcffb173a889adb4942e0705ac1b21103c4b4b14d1cc394ccd86a59b7fc152
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a suspicious URL, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=fifty+shades+of+grey+cast+age PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fe4627d3199a.pdfIn PDF document text
    • http://1xbet-registrat.site/likitacv7zp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fff42edd9195.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/is_the_apology_line_podcast_real.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_602472cba887a.pdfIn PDF document text
    • http://reduslim-europa.site/zobubajerapeso6oxe6.pdfIn PDF document text
    • http://vugijow.iblogger.org/cursive_alphabet_tracing_worksheets.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/cell_biology_in_telugu.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/sifudlw02n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fcc777765f1f.pdfIn PDF document text
    • http://akfb.online/1079232276830pc5.pdfIn PDF document text
    • http://tehnikator.ru/tesifubuzajejudewordy5a5.pdfIn PDF document text
    • http://stavki-na-sport.site/jezifosiwuy7mb9.pdfIn PDF document text
    • http://rabota-plus.club/xonamozowv7sp3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejojofumitob.rf.gd/48267333024.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/video_from_twitter_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/nidixodalelevitokuludi.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/38187218611.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/lifogikufog.pdfIn PDF document text
    • http://godorapibiveze.epizy.com/55610779158.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/pisepiwamesexav.pdfIn PDF document text
    • http://davirokonal.epizy.com/63617315805.pdfIn PDF document text
    • http://sawutex.rf.gd/barrio_bravo_libro.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ad04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD04 5308 bytes
SHA-256: dbb9d54be537c24affd4a0f910be39a592ed88c787f20664b6193e51768504b6
font_01_sfnt_off0001bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF22 13264 bytes
SHA-256: ccdbb81116095c4732f7a2cf3d05dce3e8a3f1fcdaeb1c094f1d2e6dd83f4d39

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