Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f760f4b60b734…

MALICIOUS

PDF

85.2 KB Created: 2021-04-12 19:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e48c751046d86cde565b728b635ce703 SHA-1: 24185e61cc86058ae4d8fc7eafa83e723dd5bd13 SHA-256: 191f760f4b60b734d9081de252ec66aeae3dc640d5f2697a6863f1cef334eaa3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=tacky+the+penguin+worksheets PDF link annotation
    • http://vopezikililurab.mygamesonline.org/15345510965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5fdf0f80251de.pdfIn PDF document text
    • http://pasendapp.online/36299318301mzg55.pdfIn PDF document text
    • http://ergors.space/46419194875jn28s.pdfIn PDF document text
    • http://idealica-columbia.site/the_art_of_war_chapter_5_summarylfmy1.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/cJTNaha/bijod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601770d067b38.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/8882198.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/gorituvoxe-rekaze-jilamisi.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/5cc52fe261a31a9.pdfIn PDF document text
    • http://copyright-services-us.com/how_to_replace_filter_in_kenmore_refrigeratoruy5bq.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/7652b.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/99347723383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_600bcd3c2b06a.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/kuwirexoserime.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/vSjjtGp/pikmi_pops_bubble_drops_maker_refill.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/ih1mZxe/wapogarezetipugamusimuv.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/puzesatibebonasove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/o_level_biology_past_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/31572395256.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/fizanokedaxugubewom.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/65205467211.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/pazepa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 5252 bytes
SHA-256: 946fbef6defbe9b43ad298df28e8fbc42618eaa73614bbc959287dd620fc1be3
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 11760 bytes
SHA-256: 547eb41b3f814af638c10b684c4de5593d55029ae1a8c09b5476e6c8aee1f6cb
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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