Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e449575d42179…

MALICIOUS

PDF

81.4 KB Created: 2021-03-03 06:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 456c29fea7bbed67c58241220a1324c1 SHA-1: 644999fa50c13b48d13b006c3f86eccdf4cfe58c SHA-256: ec8e449575d42179a3c3f867211ca537ff3971dc4c521fd92eb60289d914f8a8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/123?utm_term=what+smells+like+vinegar+when+burned PDF link annotation
    • http://fesupopimos.66ghz.com/banaras_hindu_university_varanasi_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/ihjgihB/gulobunivenujur.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/chi9Egg/ancient_battle_game_issues.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5ffbf897ef6ee.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/BjhsrZv/baby_alive_grow_up_doll_black_friday_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_60038a8d3804e.pdfIn PDF document text
    • http://mimasajikataza.iblogger.org/asus_rog_aura_sync.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_6032b2bfc4388.pdfIn PDF document text
    • http://rozewawat.22web.org/zigatapegipumizenez.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hxDgmRQ/what_zootopia_animal_are_you_buzzfeed.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/23iiGxZ/27921379693.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/SgcjeH5/11531297195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5ff392d4d3723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wetevali/zetakugox.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/31597656478.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/51750621682.pdfIn PDF document text
    • http://tapanowi.epizy.com/app_china_apk.pdfIn PDF document text
    • http://lafasusatar.rf.gd/91498424211.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
    • 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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5608 bytes
SHA-256: 5d710449119da08f1e93a8015f28240fa72d892c808a29e5e7924c1acc01ee0f
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10000 bytes
SHA-256: c11ae049d993368bb846d5a720adcc2ac5a8ab6a070f22b2863e75695abc1b5b
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 16616 bytes
SHA-256: 1b2ba628f786a6a53a2e347e0c4424ff2728452c1f162074ac3e64c6542c501c

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