Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dc91b86b49e322…

MALICIOUS

PDF

68.4 KB Created: 2020-12-22 04:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2bce6270203ddfac61cb4e274d891aa6 SHA-1: a3fb19f4c1f29e223c640b182c4f77c817bf9718 SHA-256: 31dc91b86b49e322a3e6c57ea730d58e27756c08b75f3f0e16ea304cc4d9de2d
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-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://traffine.ru/aws?utm_term=justificatif+de+domicile+exemple+pdf PDF link annotation
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/pubuzarofuned.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/wuniku/calculus_volume_1_by_s_narayanan.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/jaxarefab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde8bd64ad8390d8b778f30/t/5fdeb3ebfb7de13a6460b83f/1608430571721/jimubebuwusodud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618c00e2-011f-46e7-9a96-96ccd4219c27/72221652726.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/67054428319.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/56481403173.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/53866255056.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/keep_on_chugging_along_images.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78fbebcf5f06bcb797f70/t/5fcbb0a3393ce47356392475/1607184548064/98781370554.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/formal_dresses_online_shopping_usa.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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 5260 bytes
SHA-256: ea08e00e6dd626b7b2b16c5c6bfd324db17d9b8d97288f783f02da36b3db08f9
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 11496 bytes
SHA-256: d0074ec26655c3c1c05331c64a0e8840abe6cfa6b219f504821a4b6c237fc669