PDF malware analysis — malicious · 16f954228203efc5

MALICIOUS

PDF

45.8 KB Created: 2020-04-02 03:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 6d896f75c4db04f9e8a5191d2652c77d SHA-1: 9080698b1cd3444d5a458f679f6b26f16aab3166 SHA-256: 16f954228203efc5eb34c0210d69ad090018383e815c185767bf4f63afe83cae

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of external links to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The embedded document body text, though partially garbled, contains references to the URLs, suggesting an attempt to direct users to these external resources. The primary goal appears to be traffic redirection or potentially distributing further malicious content through these linked PDFs.

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://breathofautumncounseling.net/uploads/1/3/1/3/131379844/131379844.html#filtro+pasa+bajo+con+amplificador+operacional
- http://hikingandclimbing.net/uploads/1/3/0/3/130323401/7041521.pdf
- http://backyardgiantgames.com/uploads/1/3/0/5/130589207/b0ae6604b57a6.pdf
- http://3lmboutique.com/uploads/1/3/0/2/130287727/2875300.pdf
- http://keyproserv.com/uploads/1/3/0/9/130969708/4877411.pdf
- http://pestease.com/uploads/1/3/0/5/130538859/828be91fb24.pdf
- http://withinthewildflowers.com/uploads/1/3/0/7/130776616/puzetezib-zugozi-zepomos.pdf
- http://balticsportsciencesociety.com/uploads/1/3/0/6/130640199/2687956.pdf
- http://persianasexternas.com/uploads/1/3/0/5/130542734/zisokujefex.pdf
- http://glutenwar.com/uploads/1/3/0/5/130543064/lijidafugu_bizawilavis.pdf
- http://harveyhomeprep.com/uploads/1/3/0/8/130874645/8616663.pdf
- http://therealitygamefactory.com/uploads/1/3/0/6/130605120/5391868.pdf
- http://coralscreations.net/uploads/1/3/0/9/130969595/zorejixifuz-wefum-punafon-zatejagokuxoz.pdf
- http://evylareau.com/uploads/1/3/1/3/131383770/fae03.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/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000746b.bin` `847e7411ce8dce8e36b50630d8aa552fa17d1889b6f120e7dac2043e8795019a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x746B	8464 bytes
`font_01_sfnt_off000094df.bin` `779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x94DF	16036 bytes

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