Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff09eebd0949eb7…

MALICIOUS

PDF

63.8 KB Created: 2020-11-10 23:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9be5167455175f5437d742413cb4e9dc SHA-1: df94573252420ae4079b3b68e6c8523c4acae082 SHA-256: 0ff09eebd0949eb72455e0055f3fb131e05412ed7b6ae0a6444a10675084345a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?keyword=vocabulary+study+guide PDF link annotation
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/fotikivawodozi_jelijuselus_zelorabulujos_zujanadixikiw.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/dosapisobi.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/27563b.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/1d4e5dba7.pdfIn PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/4512722.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/zarelusipofox/dasug.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/mazotakumovalunife.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/kufupivedovekusagesusa.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/photoshop_cc_2019_portable_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/46485433482.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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 5312 bytes
SHA-256: 237f6b2ae560ccc11d666d1c005fa0e2d457c36a7082322e61032b24d14c8f10
font_01_sfnt_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 10348 bytes
SHA-256: 60b31a4c4cd752643f11f9a357cb6a39515b5b22045a79e9e2a91d34aa9d633c

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