Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce18125fee528b4…

MALICIOUS

PDF

67.6 KB Created: 2020-11-19 04:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d7becf4106d37971667fc33ab6b5b74 SHA-1: 8437663a26665907cf305e776ebbef8a02445da2 SHA-256: 8ce18125fee528b4deb81a311e636589115891fc5c1173bcd384677ae804efe5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to a link farm hosted on weebly.com, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the link farm heuristic point towards an attempt to redirect the user to a malicious site for further exploitation.

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://traffnew.ru/aws?utm_term=irs+simple+ira+tax+form PDF link annotation
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/85552ebcb192988.pdfIn PDF document text
    • https://resumaseba.weebly.com/uploads/1/3/4/3/134318739/5bf29b8bf0a40ff.pdfIn PDF document text
    • https://suxarunulabi.weebly.com/uploads/1/3/4/8/134854185/zatexavodejeboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_5fb564c1cfacf.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/buvuro_zufivetiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5fa9a931e1f61.pdfIn PDF document text
    • https://belumikifisa.weebly.com/uploads/1/3/4/6/134666155/4971465.pdfIn PDF document text
    • https://jaxirifaru.weebly.com/uploads/1/3/4/5/134500995/6bd564238a8.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/jenewifuz-zamodepopimo.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/xumakomowi/self_hypnosis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2102e12-a56b-4a43-8d16-a59684688fe1/teton_village_condos_collection_by_j.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/sports_clips_printable_coupon_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/cantaloupe_island_trumpet_solo_transcription.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/african_american_political_thought_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4019f7a7-1965-47e2-b057-a7306fdf01d3/ethiopian_bible_verses_in_amharic.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_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 5052 bytes
SHA-256: 244023b5ef9606fb02f0fb191aad719b5c74420fce6203e502f998e21284a5e2
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11072 bytes
SHA-256: e67b69f73158c265867c9088a7028e181304a13a2e6c1af2d4e1db991dca697f

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