Malicious PDF — malware analysis report

Static analysis result for SHA-256 9718765095aa8fe1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 08:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bb6646091cbb201e014706c8f97f7148 SHA-1: 224a5411ab07da3f43ea809f0d70bd31c49d9840 SHA-256: 9718765095aa8fe1ec32008a94cda987b2f2844242059f7c312a698d7a4dee0e
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which are part of a link farm designed to inflate search engine rankings. One prominent URL, 'https://zajinet.ru/123?utm_term=organelles+of+the+cell+worksheet', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via the linked PDFs.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=organelles+of+the+cell+worksheet PDF link annotation
    • http://manuximaxemeje.scienceontheweb.net/9132256534.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/asme_sec_8_div_1.pdfIn PDF document text
    • http://naderuromopuru.22web.org/saxasetunuvisabineva.pdfIn PDF document text
    • http://vivabozuna.iblogger.org/aluminium_extrusion_process_project_report.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/zopevux.pdfIn PDF document text
    • http://perikovu.iblogger.org/is_yuffie_in_final_fantasy_7_remake.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/equilibrio_acido_base_ejercicios_resueltos.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/vusopunijonerarusaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisanexurosil.rf.gd/xugufuzifibe.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/cg_movies_full.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/acordes_de_teclado_tus_cuerdas_de_amor.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/is_windows_movie_maker_available_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/55412776245.pdfIn PDF document text
    • http://kasisexa.rf.gd/busuwozena.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/what_is_the_best_genre_of_music_to_study_to.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/mugimadenodetituvibol.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/zobibigido.pdfIn PDF document text
    • http://givovuzozej.rf.gd/d_d_5e_gloom_stalker_guide.pdfIn PDF document text
    • http://dokelasera.rf.gd/the_tempest_study_guide_act_2.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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5328 bytes
SHA-256: 0199dd86cf6cedbf2a35d2885e16fd48d2574dc17d8e6ebc435740c1439752c4
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 10828 bytes
SHA-256: 0f392ed6230787ba673dd0811e394910e3267da147c67163fead39d2dcf55710

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