PDF malware analysis — malicious · 5c43fe7790ebfe8a

MALICIOUS

PDF

55.5 KB Created: 2020-04-08 22:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 512dc80d528b058a0724859e264960ee SHA-1: f3753477085007a9fe23f4931af69f918ed78111 SHA-256: 5c43fe7790ebfe8af7424dd804dfd799c0b34fbafbcc6480c93fbd38efd100ca

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to unrelated domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'Wicca for beginners pdf' and the authoring tool 'wkhtmltopdf', suggesting a lure to a collection of SEO-optimized PDF links. The ML classifier also flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9229

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://project-gp.com/uploads/1/3/0/6/130639030/130639030.html#wicca+for+beginners+pdf
- http://customcreationsbyjanna.com/uploads/1/3/0/5/130551957/wifolilozademew_lodimiluwoduluk.pdf
- http://hummingbirdlaneorganicflower.net/uploads/1/3/0/2/130270738/fbde96.pdf
- http://vintut.nl/uploads/1/3/1/4/131437826/511787.pdf
- http://taylorgantt.com/uploads/1/3/0/2/130274109/xarorokumajibe.pdf
- http://ianthemarini.com/uploads/1/3/0/6/130620195/2080557.pdf
- http://www.thdl.org/http://www.thdl.org/Tibetan
- 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://www.gnu.org/licenses/
- http://www.gnu.org/copyleft/gpl.htmlTibetan
- http://www.adobe.com/).Noto
- http://www.google.com/get/noto/http://www.adobe.com/type/This
- http://scripts.sil.org/OFLNoto
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006562.bin` `54915fcbf336f8b27d3d3ee0b72428b799a47589267a02861a935303d29ea9b8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6562	9872 bytes
`font_01_sfnt_off00007832.bin` `47af76e461398d7e8a9e5849082d599943f285351a1f950a7b64aad5b26bf65b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7832	8504 bytes
`font_02_sfnt_off000098a2.bin` `2a4f0ec9d86833d116b1bbbc7fda3b245fd7f2cf4680d04db1018552282c2917`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98A2	4412 bytes
`font_03_sfnt_off0000a65f.bin` `04f67c5d98a32331f5fd0fc587283a5c67d02220b20d11b40284d2fd71d5a5ba`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA65F	5968 bytes
`font_04_sfnt_off0000b9a9.bin` `632ecc83d6595646b8725adaa1ac6194337f027501666e195e978a948656971b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9A9	16348 bytes

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