Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cddf18f73af6c66…

MALICIOUS

PDF

77.6 KB Created: 2021-02-14 17:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: eade8c12e4678d5c0b437c85f37c3121 SHA-1: 236ac28bb86fccbe040e7d6b3ae6a947eead5c45 SHA-256: 6cddf18f73af6c66c5318bbbe3833d7d4b22d7d2ea8fb3aee014e2f3d7d3d8e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to host multiple PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of external links suggests the document's purpose is to redirect the user to a malicious site.

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://jottigo.ru/aws?utm_term=aranesp+administration+guide PDF link annotation
    • http://rte-ita.fun/63792700034aa5nb.pdfIn PDF document text
    • http://vkrowl.com/505240190211wqnp.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/hfKhjhe/30717689320.pdfIn PDF document text
    • http://steelsho3.club/68679806093l1dts.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/219353.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/zedulumujakanojed.pdfIn PDF document text
    • http://silver35.ru/137189114687nj7z.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/iijhFCU/words_within_words_generator.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/7e16b7acd7573.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/wusone/ashes_cricket_2013_free_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/scream_go_hero_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/barthes_from_work_to_text_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/awake_jin_mp4.pdfIn PDF document text
    • http://jopavufugas.epizy.com/52782392014.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/gl_assessment_maths_familiarisation_test_answers.pdfIn PDF document text
    • http://zusewijoje.epizy.com/radifopatosupif.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5236 bytes
SHA-256: c06bbb6c10c690be594418031b5169ea8ea6100b5e8dba57665d3262df47ba4e
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11516 bytes
SHA-256: de7027e42def421d82182cd62600c518b50a7410b58f2242103af6899b8b9bca

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