Malicious PDF — malware analysis report

Static analysis result for SHA-256 f284fbd6d0958b23…

MALICIOUS

PDF

46.9 KB Created: 2020-03-28 08:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb999f7d5e44f7a8122459b707823285 SHA-1: c78d4ececf31df83f00e2d77feb1bfff88b6a30c SHA-256: f284fbd6d0958b23a588d0cad506fa2d0d284a8ad86997addcb654053ee453dd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of 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 suspicious nature of 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://innovationisland.org/uploads/1/3/0/8/130874526/130874526.html#protein+shakes+and+breastfeeding
    • http://skyfootgoddess.com/uploads/1/3/0/2/130271030/8351405.pdf
    • http://www.keencricketcoaching.com.au/uploads/1/3/0/5/130541116/fisijosizokigen.pdf
    • http://akikomueller.com/uploads/1/3/1/0/131070583/4921796.pdf
    • http://iheartblue.org/uploads/1/3/0/6/130621306/lepopifo.pdf
    • http://www.sumaiyakhalifa.net/uploads/1/3/0/6/130639552/57e79b.pdf
    • http://genesis126construction.net/uploads/1/3/0/2/130292014/9309869.pdf
    • http://unfairadvantageonline.com/uploads/1/3/0/2/130271209/pifotujov.pdf
    • http://www.freeiigrow.com/uploads/1/3/0/4/130488736/foragosiw-pefibomuxuza-borefo.pdf
    • http://prceducationlaw.com/uploads/1/3/0/8/130873971/333128.pdf
    • http://shantarassoapandcandlecompany.com/uploads/1/3/0/9/130969800/jobejakogojuji.pdf
    • http://74-123-72-71.mgwnet.com/uploads/1/3/0/2/130288751/5019156.pdf
    • http://kicknice.net/uploads/1/3/0/7/130738871/golulirujuzuw.pdf
    • http://tjblileyiii.info/uploads/1/3/0/6/130621390/134965.pdf
    • http://www.stuartkellynz.com/uploads/1/3/0/5/130543264/vafomoka.pdf
    • http://marineinpink.net/uploads/1/3/0/7/130738684/kawafifuge.pdf
    • http://nkz.brdge.org/uploads/1/3/0/4/130488615/tibiguwelo.pdf
    • http://christianfamilyblog.org/uploads/1/3/1/3/131379696/wevowatusikab.pdf
    • http://countertopspdx.com/uploads/1/3/0/5/130551653/6139897.pdf
    • http://silva-realty.com/uploads/1/3/0/7/130775694/rajuf.pdf
    • http://glencovemobilehomepark.com/uploads/1/3/0/4/130483265/remupolelerudujilaw.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_off00008f2b.bin
593c9027e8c2120a9ce81b99ab292f54b228a5f7ebc95f7556e49467bf813e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2B 8012 bytes

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