Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b10cab075e2fe…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 07:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b10aed227f2480c5c072d43b3a835f61 SHA-1: f6e81e3e7f0e18cad51da7076d9735667128df4f SHA-256: 4f4b10cab075e2fe4698050ef920d802d5c25f0a05946956d84e84731435a364
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure designed to redirect users to malicious content.

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://nipisod.ru/wix?keyword=forest+ecology+word+whizzle+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387581/normal_600cfaf9c7109.pdfIn PDF document text
    • http://sadanojigoma.22web.org/webkinz_jelly_bean_challenge_guide.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/7c7225ee74.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/8907296.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/2f63bc55.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/dunawamowefat-luzusanulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5ff69241cf79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_600b33cc1dfcf.pdfIn PDF document text
    • http://useraisins.pro/lavisokewojokwe0v.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/zemipowesekulav-medevuki-kuvosokuzas-molol.pdfIn PDF document text
    • https://gulikefesagigal.weebly.com/uploads/1/3/5/3/135303577/fojegibikigo-keditu-labefuvok-kadalovaferu.pdfIn PDF document text
    • http://hookup154.fun/castle_in_the_sky_piano_sheet_music763mv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ffd353e3161b.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/safenalavojuwu/board_game_template_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/do_i_need_an_oxygen_concentrator.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/action_potential_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/jekexezibaditulagimuga.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 5400 bytes
SHA-256: 86b5dc0f7f5be6bb389c5df15d7644dead3ab6ac7d01c1b928beb049bbbcda45
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 9956 bytes
SHA-256: 06bb923dda343539b36b00e5aa611c7b6ba9b11105d0a3e838181d278c8fbc24

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