Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b35c7404e790f…

MALICIOUS

PDF

34.3 KB Created: 2020-04-03 18:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d758cbd2a6d0453bb7e26ad0a37958e7 SHA-1: e5b3f461e28200ec385a1beb7b0edbea3ba0b9a9 SHA-256: 6d6b35c7404e790f44846cfe4efc55ebd5d2ef24d01870155d3592166b4880fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ClamAV detection 'Pdf.Dropper.Agent-8496655-0' and the ML classifier output strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a dropper or downloader mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8496655-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8496655-0
  • 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 http://aesystems.org/uploads/1/3/0/4/130477007/130477007.html#libro+de+la+vida+verdadera
    • http://livingtheedge.org/uploads/1/3/0/6/130639678/masoxiz.pdf
    • http://sacredsecretskincare.org/uploads/1/3/1/3/131381411/nanonisef.pdf
    • http://damedidit.com/uploads/1/3/0/7/130775728/f8fc522704059.pdf
    • http://breslinep.com/uploads/1/3/0/6/130620695/mapavunokeb_wefoxosavewej_tuvidul_paxususi.pdf
    • http://darkmoonastrology.com/uploads/1/3/1/1/131163977/mizagobavave-ruzubepivisuxib.pdf
    • http://thesenioralbum.com/uploads/1/3/0/3/130323291/fd0dc297514.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006081.bin
eafbbbc155145204fe21b2282525f06b220c68424a1b50fac22574d9be69779a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 7200 bytes

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