Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de9cbb7a01a36e3…

MALICIOUS

PDF

43.1 KB Created: 2020-04-06 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7a06d4965e495fd4b8fc9bf8856e801b SHA-1: 338d49a2e1faa9138258a5a2d4ecad65840b6910 SHA-256: 0de9cbb7a01a36e3198ce3f564e5c18f6bc0372caf8b96ea5471ac72fe39b43c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://gmchamberpatrons.com/uploads/1/3/0/4/130435524/130435524.html#best+books+for+computer+hardware+engineering
    • http://rpmbeatlesmusic.com/uploads/1/3/0/6/130639760/ganazakijapi.pdf
    • http://briarmoorpool.com/uploads/1/3/0/2/130270763/xuwuwuduvirok.pdf
    • http://chessrandomly.com/uploads/1/3/0/6/130604085/1591127.pdf
    • http://stlmarketingconcepts.com/uploads/1/3/0/7/130776157/5240217.pdf
    • http://rocketbetty.net/uploads/1/3/0/2/130270894/2845413.pdf
    • http://timbercreeklogging.com/uploads/1/3/0/7/130739829/nugunozezojifanifef.pdf
    • http://cancilleriammas.org/uploads/1/3/0/9/130969179/3991366.pdf
    • http://boutique-lea.com/uploads/1/3/1/1/131164251/kifudatimilenejev.pdf
    • http://lrasmussenillustration.com/uploads/1/3/0/6/130605044/924118.pdf
    • http://kellholm.com/uploads/1/3/0/8/130874240/junaxobudu_nekesamoku_moparigon.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_off000080be.bin
d2aaf5752977d96b6b72d89449b704e5dd55614ba7a725f5c375223f2c7524c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 7876 bytes

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