Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba8573a20c06337…

MALICIOUS

PDF

41.0 KB Created: 2020-04-04 16:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b68fc48900716d021a224aa18d03f59 SHA-1: 470323b43fcdfba3f3a953e31c0e29d63ca26496 SHA-256: 7ba8573a20c0633760f2a0d1729d0bafa6bdc4bfc6b8e6156fe9a0e729902b82
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, while containing metadata about the PDF creation, does not provide a clear user-facing lure beyond the title, suggesting the primary malicious function is the embedded links.

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://caitclements.org/uploads/1/3/1/4/131453061/131453061.html#atlas+de+histologia+normal+di+fiore+8va+edicion+pdf
    • http://nicholeguerrette.com/uploads/1/3/0/7/130775276/4579322.pdf
    • http://deborahannwong.com/uploads/1/3/1/4/131406354/jozeximixidivum_rewetivekokid_xibekezagiza.pdf
    • http://erathcountyacreage.com/uploads/1/3/0/7/130776680/f821254adf7.pdf
    • http://steveburketraining.com/uploads/1/3/0/9/130968957/wuvotonabedideja.pdf
    • http://shymiahchanelextensions.com/uploads/1/3/0/9/130969920/3c6f4b187c1ce.pdf
    • http://craigjacobson.net/uploads/1/3/0/2/130270894/satajito.pdf
    • http://dk-electrical.org/uploads/1/3/1/4/131407281/6485935.pdf
    • http://newwavepoolsandspas.com/uploads/1/3/0/4/130483606/914f961b4310.pdf
    • http://trevier.net/uploads/1/3/0/8/130873818/bexolope_tuxefozur_gabogeki.pdf
    • http://apromtech.com/uploads/1/3/0/5/130540504/pomodita.pdf
    • http://callatinocaucus.org/uploads/1/3/0/2/130289333/2c8f270f7fe08d.pdf
    • http://davidheydenrych.com/uploads/1/3/0/7/130739232/4e2ab3f1.pdf
    • http://webmail.michelrivard.ca/uploads/1/3/0/6/130621669/silamosawara-luvoniwikaruj.pdf
    • http://clicksncaptionsphotography.com/uploads/1/3/0/7/130739328/nojupo.pdf
    • http://theangelcompany.net/uploads/1/3/0/4/130488544/moluni.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a9.bin
92e4e977ba8575ee8df4726e3e5880971a680b7bd26010ce2569c40b444880af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A9 8556 bytes
font_01_sfnt_off0000818e.bin
cd6e2214da57f5b11be58045a259cadbf00e25d96f42fa7f3a4e452f21d7d3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 16084 bytes

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