Malicious PDF — malware analysis report

Static analysis result for SHA-256 825210ab4d7531cd…

MALICIOUS

PDF

71.1 KB Created: 2021-03-01 18:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7170df6ff4ccaa6e7aec2701a45901db SHA-1: 137f777e382f4efd67f13c3b693810ccf75b3ec7 SHA-256: 825210ab4d7531cdeea7de789e67e4eeee3a6770a04828807c051028463539a8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or unknown reputations, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

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://zajinet.ru/award?keyword=ionic+and+covalent+bonds+worksheet+middle+school PDF link annotation
    • http://zonerokemub.getenjoyment.net/celestron_nexstar_6se_telescope_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hdN8Sge/42141265264.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/hhbRFii/zombie_gun_vr_shooter_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/QVjd6VL/saxelekove.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/MgfBub6/rorogojasoxogebuzifudol.pdfIn PDF document text
    • http://tivulaxovena.22web.org/palabras_agudas_llanas_esdrjulas_y_sobreesdrjulas_ejemplos.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/how_to_be_patriotism.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/KFjijfl/zuwepij.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/WCicghU/kekekab.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/himrOia/rojoxizulire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofuvawitarul.atwebpages.com/holy_blood_holy_grail_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/88595055418.pdfIn PDF document text
    • http://xabenigirujufoz.epizy.com/ludexogogefojilanot.pdfIn PDF document text
    • http://telatojewoka.epizy.com/accounting_manager_resume_template.pdfIn PDF document text
    • http://xojesenokok.epizy.com/plural_possessive_nouns_worksheets.pdfIn PDF document text
    • http://bijasubibivov.rf.gd/adobe_spark_video_android_alternative.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 5472 bytes
SHA-256: f1cb91b3f92e51c46a704b8068ef72dcc0f0092b3bdf08ccc2a2231032a3824d
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 10240 bytes
SHA-256: 03248358ce1d423aab1dd31a9c1f6caed7ae5341b9193a588798a94ea8fa26e5

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