Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb1d2db914bb6f2…

MALICIOUS

PDF

81.8 KB Created: 2021-02-19 05:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e9ba05c625550a5c5e67939c135c339a SHA-1: 239ccd15ccc43f65835c618d0e8458cc8ef690c1 SHA-256: 4cb1d2db914bb6f29604e20af7e73a05907bc459bde2738494dbd9c3546375d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of these links, https://jacksth.ru/strik?utm_term=a+christmas+carol+book+by+charles+dickens+summary, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

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://jacksth.ru/strik?utm_term=a+christmas+carol+book+by+charles+dickens+summary PDF link annotation
    • https://cdn.sqhk.co/xuvivazonewa/diiFuhi/tuzukis.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/bhchgPW/spelling_test_quiz_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/heZjaih/keponafuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/3hijehi/std_10_ssc_board_exam_result_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/dgcBSvk/tanglewood_golf_course_nc.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/244302.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/BiasFLB/2076966773.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/xoteva_xotoli_daxutadunixo_bosajasoxa.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/5116993.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/565hche/78390792714.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/minaxigevani/89977482222.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/template_builder_window_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/beach_animated_wallpapers_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/tamasha_full_movie_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/98698972607.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/varogupizojevojedu.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_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 5472 bytes
SHA-256: a9efeda226c646c6acca39da4c6f889e59fc9845646afcd61c4c0b24e36be395
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 10024 bytes
SHA-256: 0552281698d8972e2082d62faa59d5da71b36ae4f109fbc4d0712116888dbd3a

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