Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9658678c37a00b…

MALICIOUS

PDF

37.3 KB Created: 2020-04-02 10:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 379275ab8113b0c0cc29730ac672b2ab SHA-1: 772c7b4af096b461ef44eb2756fa51a1a1389c15 SHA-256: 0b9658678c37a00bfeb3ee2682231899667c30bad0fc6910317bf9467d6b762e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it functions as a dropper. It contains a large number of embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or SEO spam operation. The document body itself contains text related to unit conversion and application metadata, but the primary malicious activity appears to be the redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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-8644240-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8644240-0
  • 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://spacecreationdesign.com/uploads/1/3/0/6/130621587/130621587.html#inventa+un+problema+con+medidas+de+capacidad+de+litros+a+galones
    • http://bailaymeditaibiza.com/uploads/1/3/0/8/130874691/mirusemaxul.pdf
    • http://fairfieldaero.com/uploads/1/3/0/5/130540281/susinalava.pdf
    • http://graspassociates.com/uploads/1/3/0/7/130775646/jevidun_jujiriruzenam.pdf
    • http://bergcopy.com/uploads/1/3/0/5/130588653/badeteg-fukowa-sagexoduponosan-fipatabalikosi.pdf
    • http://planetaconsulting.ca/uploads/1/3/0/3/130379457/nesazukiwivun.pdf
    • http://mobilematerialsco.com/uploads/1/3/0/4/130490687/5422851.pdf
    • http://southamptonluxuryestates.com/uploads/1/3/0/6/130603958/gomurugosomikuxolep.pdf
    • http://wisconsinhomes4sale.org/uploads/1/3/0/7/130776166/ritag.pdf
    • http://promedex.net/uploads/1/3/0/6/130639476/pozowi.pdf
    • http://ltgsm.biz/uploads/1/3/0/4/130477882/wigonup.pdf
    • http://jynsenhenry.ga/uploads/1/3/0/4/130489025/8976772.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_off00006564.bin
182a420946eb95971517ad11f10bd6deff5a77aa8fd941526193d5f6b7c8285f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 8832 bytes

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