Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff15873235f54770…

MALICIOUS

PDF

36.7 KB Created: 2020-04-13 17:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd643a8cdb4c215cacb1df0a601afceb SHA-1: d39128b71274712a4d47da69427a7978a4dc49e7 SHA-256: ff15873235f547709f64b0f0fd106811b285f60860d9779b67676a6f866f3337
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with over 30 links pointing to various domains. The primary purpose appears to be SEO spam or directing users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://wealthymarketplace.com/uploads/1/3/0/3/130323097/130323097.html#fb+carousel+ad+template
    • http://bjwoodtx.com/uploads/1/3/0/4/130483670/wozosexopivaw_berow_sigodava_mumigof.pdf
    • http://buckfinishes.com/uploads/1/3/0/3/130313247/2840553.pdf
    • http://rochafishing.com/uploads/1/3/0/6/130620747/26e57d04.pdf
    • http://txfedblueseed.com/uploads/1/3/0/7/130776737/6297709.pdf
    • http://quigley4duxburyschools.com/uploads/1/3/1/4/131406934/7581806.pdf
    • http://aniawjewelry.com/uploads/1/3/0/2/130271038/3889542b4971ea.pdf
    • http://ellanah.com/uploads/1/3/0/7/130739974/pifumipedekafe-gaxadon-detifuwin.pdf
    • http://tacomadefense.com/uploads/1/3/0/6/130620698/fenonipi_pegimutu_bowiv_zopazulodiw.pdf
    • http://haycockphotography.com/uploads/1/3/0/6/130639363/7989009.pdf
    • http://resonancega.com/uploads/1/3/1/4/131406564/xodawesubado.pdf
    • http://hand-made-costume.com/uploads/1/3/1/3/131384407/9088263.pdf
    • http://sleepvillecanada.com/uploads/1/3/0/8/130874681/lafusekejosujawiku.pdf
    • http://pacopioneervalley.org/uploads/1/3/0/6/130639092/71e9983d53d60b.pdf
    • http://ahimsaartworks.com/uploads/1/3/0/7/130775826/7724076.pdf
    • http://heyprettyface.com/uploads/1/3/0/3/130379206/mogonikikasokul.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_off000066b5.bin
a6fa36cb4771a96d9790f29daf01b61f8e6ec8298cd9a02197bd0027c4a82445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 8316 bytes

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