Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84dfbc26bc418b2…

MALICIOUS

PDF

70.1 KB Created: 2020-12-23 05:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0ee7717a080a0541bfd640cb2b6ab1fd SHA-1: 0bffa981b325024c391a4212a501b49492193729 SHA-256: d84dfbc26bc418b2432f352555eeb6aa4410ba14972e278272187b22d44a780d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to 'https://traffnew.ru/123?utm_term=anatomy+of+the+constitution+icivics+answers', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear instructions. No scripts were extracted, but the presence of numerous external links strongly suggests the file is designed to redirect users to malicious sites.

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://traffnew.ru/123?utm_term=anatomy+of+the+constitution+icivics+answers PDF link annotation
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/ratozegesigikova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lokijuronig/marathi_kadambari_file.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/foundations_digital_insurance_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8974951a-e6d2-48b4-8eb2-080387eec0b7/nosabenalexifevivake.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/45907177915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c221d537-2073-44bf-a29a-1c123304c829/58731345859.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bimaxepavanow.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/xivekemarikegoguxoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d23b231-e000-4e0a-bb3b-30e7f733bce0/46363149760.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tozaruzufitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 5212 bytes
SHA-256: d0a7ffa2045e37037f42c411baf12d8d2aa4080be978ea5b37abf0a1eb4f8450
font_01_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10224 bytes
SHA-256: 38f5a596601b1aeb2b28b0bcde62c742c6962499947b43916355836dd4d0aa20
font_02_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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