Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c9a8779856bcd4…

MALICIOUS

PDF

71.5 KB Created: 2021-01-12 16:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d0464bd18f8858cf6a43b34772d8969f SHA-1: f836c403a9b90969de2e2930ec4331c00902f774 SHA-256: 46c9a8779856bcd4fed307b3003a948c0e6ab7cdbd60e56b3c76adaf9cf33a87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

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://traffset.ru/123?utm_term=carl+demaio+voter+guide+2018 PDF link annotation
    • https://site-1177041.mozfiles.com/files/1177041/xebasitedivara.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/kibijizeb.pdfIn PDF document text
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/sizomoni.pdfIn PDF document text
    • https://site-1176507.mozfiles.com/files/1176507/sazekenikirat.pdfIn PDF document text
    • https://site-1168153.mozfiles.com/files/1168153/top_20_hashtags_for_instagram_2020.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/juwolo.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/didowugorokirug/xelexefutevubunasip.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/beamforming_technology_in_5g.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/gevafamumetajes.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/68412117355.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/archery_big_match_mod_apk_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/bootstrap_footer_template_code.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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 5452 bytes
SHA-256: 466b16d04d40c49d249c12d61350186521f839007e9cab89b4c8b874879791a4
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10560 bytes
SHA-256: 4dc0cae58c2b49d1393e64608e3bdd963b1eefe0b84c89b1d7f988fb3f7d5ab9

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