Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be6fe08073b345…

MALICIOUS

PDF

70.3 KB Created: 2021-01-07 15:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3235660880e5e2d0bcb382a3f27f97ad SHA-1: 75a6fe559ea93c761649f01922dee00b1122e7d9 SHA-256: 31be6fe08073b345c4985c7505c2f0be0b69bb181d233986ab24efc0559005aa
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=chicago+to+uw+madison+bus PDF link annotation
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/7404602.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/wegugus/pufapoxonomevow.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/retinopatia_diabetica_clasificacion.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/50495918730.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/99481068538.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/vpn_for_iphone_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51636eec-33e7-4204-ac6b-bfcde8a6f786/magic_rampage_2-_6_ghost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a08baf2-65ff-4f0d-977d-6c0f1d60107a/40518112832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867856df-96b9-43ae-a20c-196d14e8fb01/sodezagikovazupagopesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cda4dd-d63d-4e39-9d21-128deb1d5826/kejigasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce3758a-80f3-4cf4-9fd0-08fb91cd1b26/sudazaxotikaroweg.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/jolly_phonics_sounds_video.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 5364 bytes
SHA-256: c4c59d3912ddb3b3618aa82ef19b24d1012028f4d80577ffe5434226aa69505f
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 11600 bytes
SHA-256: e97b2c711ecd65aab1a6dc5cb3da164fb75a6ec32b65749fdc7f06db6ed45389