Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac1876909959611…

MALICIOUS

PDF

42.2 KB Created: 2020-03-25 14:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1af70bc91db126760f8afe8062643cb4 SHA-1: df900abaac913ab80f8695c0c659714ef95d0a38 SHA-256: 9ac1876909959611ad8122d8f63eb81185d935ead0edf4f2fee0920fe63aac7b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern.

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://elitepracticepartners.net/uploads/1/3/0/7/130738819/130738819.html#ejemplo+de+carta+compromiso+en+ingles
    • http://nashvilletarot.com/uploads/1/3/0/5/130550884/ledafavexupi-vajenixoxip-kexonafasu-zomajokibipiraw.pdf
    • http://trobken.be/uploads/1/3/0/9/130969280/cb0c5487.pdf
    • http://www.buttoncrush.net/uploads/1/3/0/4/130436139/24cdd.pdf
    • http://kevinbergerondesign.com/uploads/1/3/0/8/130873833/8b666da.pdf
    • http://hairbyjonathan.com/uploads/1/3/0/2/130289682/1ccfe4.pdf
    • http://badassride.com/uploads/1/3/0/5/130539783/gazokoriwab-gemawonuz.pdf
    • http://mrhandgun.com/uploads/1/3/0/6/130639708/8996235.pdf
    • http://mydgphoto.com/uploads/1/3/0/6/130604582/2469670.pdf
    • http://vaulthere.com/uploads/1/3/0/7/130776823/kalukigofovuwisebafu.pdf
    • http://natesessentialtraining.com/uploads/1/3/0/2/130271073/620f6.pdf
    • http://forgedinfitness.net/uploads/1/3/0/6/130621011/lukobenoneve.pdf
    • http://thestyleinnovator.com/uploads/1/3/0/5/130543050/dezosokabaneb-bifenonowejobok-dunebikapasoro.pdf
    • http://laurenobern.com/uploads/1/3/0/5/130539928/416723883a9adb.pdf
    • http://lexily.ca/uploads/1/3/0/2/130289543/7779632.pdf
    • http://angieschickerowski.com/uploads/1/3/0/4/130478295/dukutuwug.pdf
    • http://havemypeople.com/uploads/1/3/0/6/130604126/bodoninugiruvad-vubis-zomujexiba-xujebuwaxolutip.pdf
    • http://www.justinbouldin.com/uploads/1/3/0/4/130436079/durosazopu.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_off00007a29.bin
77717b9d23f814a70a2416d174470532f95c5c1f9cb7b927d74c765b6fb8541e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 8936 bytes

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