Malicious PDF — malware analysis report

Static analysis result for SHA-256 20659f1070c0fb90…

MALICIOUS

PDF

61.5 KB Created: 2020-12-06 09:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aac18fcd7a4e0ab3cfbd3a0d39f3b5aa SHA-1: 2cbdffe0bee765a5e418ac7ef5a7a3c60bba85a3 SHA-256: 20659f1070c0fb909cd5bd0b72054d23b94b62d3dc97fb7c7f975290d7dc627a
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 0.9996

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://traffine.ru/aws?utm_term=abercromby+nursery+tullibody+uniform PDF link annotation
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/vuruzuwonukaw.pdfIn PDF document text
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/1e3dc.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/tamitasusijiv.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/rexulefo.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/wemazun/viladivowudob.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/gcse_maths_equations_sheet_aqa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279adb16-c336-42c4-bfd2-d4a049f6fc03/fojoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/adobe_reader_for_win_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/rigetuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/5113395985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2311dd9-53e4-4463-97b1-4ad74fd27e89/92497176631.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/dibot.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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 5188 bytes
SHA-256: e6ac77fca03ca8ce2ae3c4b5d57f422ebe3866ff6621853d97d3c13b2ae5e80f
font_01_sfnt_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 10176 bytes
SHA-256: 9ded4e9da49e4deeb1c0719d093f3aeb2d3153ca68bdbec7b888d4156386beb3