Malicious PDF — malware analysis report

Static analysis result for SHA-256 1144297c3271ff7e…

MALICIOUS

PDF

73.5 KB Created: 2021-04-15 08:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f573e3f168556a5c2a133cf5bd992f9f SHA-1: c93114ab55a9a9aed0295ad65a5a9dd4102cb033 SHA-256: 1144297c3271ff7e449a1017101f0b9ed2691223f22f43ca456acf2220bd7d5a
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 link farms, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/strik?utm_term=amc+8+practice+test+2009 PDF link annotation
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/mikoj.pdfIn PDF document text
    • http://fepimedofosi.iblogger.org/electrical_cabling_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/DA2ycii/talking_tom_gold_run_lucky_angela.pdfIn PDF document text
    • http://lewizakadogera.iblogger.org/poulan_pro_gas_blower_carburetor_adjustment.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/sat_math_2_official_practice_test.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/como_sacar_las_referencias_bibliograficas_de_un.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/ieHieij/pilares_del_diafragma_en_ingles.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/ibijhzv/dadojimo.pdfIn PDF document text
    • https://kekipunoze.weebly.com/uploads/1/3/4/6/134601808/ritaxi.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/cursive_writing_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/wowikasekuxul_tusesow_wibepoxuwa.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/blood_pressure_scale.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/air_mass_source_regions_worksheet_31_answers.pdfIn PDF document text
    • http://gunurovidoz.iblogger.org/anki_like_app_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/wadowagusoj.pdfIn PDF document text
    • http://fafezevasuba.rf.gd/86918093627.pdfIn PDF document text
    • http://walazej.rf.gd/english_grammar_test_for_advanced_students.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/65766411760.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 5660 bytes
SHA-256: b9e15cbd61d5e130f9c4b92b17617c7094d0b2a28a9b9990b5b692ca63482013
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10932 bytes
SHA-256: 48c5e7eaf1de1426046dc1baff07504a07e1a77336bbeac19f0830a7c7739ad9

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