Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad0b6ced11c9db7…

MALICIOUS

PDF

76.0 KB Created: 2021-02-13 17:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 55d9e67d1f93326e200914a13b3aa518 SHA-1: 591fd37e6888068d779e8ab4367172ded102c481 SHA-256: bad0b6ced11c9db75e07ae5563d64d4bef220a0e88f3c9940ec4a6b6785e1bea
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://jacksth.ru/wix?keyword=cladogram+analysis+answers', suggests a lure related to academic or scientific content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=cladogram+analysis+answers PDF link annotation
    • https://cdn.sqhk.co/mixekuwuvo/PjiijvL/barefebadaneteluvodivi.pdfIn PDF document text
    • http://idealicaitaly.site/game_of_thrones_piano_sheet_music_jac5two.pdfIn PDF document text
    • http://oneitstore.info/pursed_lip_breathing_adalaho63kx.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/7349718.pdfIn PDF document text
    • http://urro-hu.com/sample_of_works_cited_page_mla_formatb2b2m.pdfIn PDF document text
    • http://theboldpantsproject.com/13535120298ivl54.pdfIn PDF document text
    • http://biolinkus.me/stick_war_legacy_2_videost71uq.pdfIn PDF document text
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/sewodanazoge.pdfIn PDF document text
    • http://qupieasy.online/108545149795o0fa.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/zarig_xakaxufekuze_bisot.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/vapelurowar/sovazorujerebonot.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/ncma_cpcm_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/nanagegusuwevope.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/95607493471.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/gavasujemesore.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_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 5244 bytes
SHA-256: 34bcd35b8adbb6fea71636f63fec2001b8d3d53e4230ab3e4a317634c6ab6999
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10252 bytes
SHA-256: 5edf936729be8ba88112ce1d7d42cccdd0ee4057fa19e710f23410550f20730d

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