PDF malware analysis — malicious · 45b799bb0e6be696

MALICIOUS

PDF

42.4 KB Created: 2020-03-29 10:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: f4f85e3245467d7f40222fe522d5e10b SHA-1: c211f45efad85975afc2b05adc9ca8583040f485 SHA-256: 45b799bb0e6be696ecc54d86894df658e1ba567b6b37331b8f9c1dc0ed8afe54

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these links, suggesting a lure to external content. The primary attack pattern involves directing users to a network of potentially malicious websites hosted on domains like fifthel.com and melbournehotelplaceholder.devsite-1.com.

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://melbournehotelplaceholder.devsite-1.com/uploads/1/3/0/6/130620660/130620660.html#ejemplo+de+aliteraci%C3%B3n+en+un+poema
- http://fifthel.com/uploads/1/3/0/6/130639157/7f40209d581.pdf
- http://neighborhoodpsychindy.com/uploads/1/3/1/0/131070776/nekamowatisekomabez.pdf
- http://theawesomeguide.com/uploads/1/3/0/7/130740232/sapujan.pdf
- http://www.tfqstudio.com/uploads/1/3/0/7/130739971/224915.pdf
- http://cemsinternational.com/uploads/1/3/0/7/130740562/faboliwawejex_zawetidasejumas.pdf
- http://shelneygirlfriday.com/uploads/1/3/0/7/130739012/9f2767d8fd65a9a.pdf
- http://doorrushfour20.com/uploads/1/3/0/6/130605278/kuzipivobosajitoso.pdf
- http://mta-sts.fw1a.ingridliberte.com/uploads/1/3/0/6/130622022/52826.pdf
- http://cwb4nepal.com/uploads/1/3/0/7/130775629/wusazuran.pdf
- http://leannephilip.com/uploads/1/3/0/6/130605175/volarafepubodid.pdf
- http://www.samshineart.com/uploads/1/3/0/9/130969281/a6dba0e716dee.pdf
- http://greshamheadshots.com/uploads/1/3/0/3/130324152/aa634ebac673522.pdf
- http://yolodestinationparties.com/uploads/1/3/0/7/130740517/subidapasan.pdf
- http://boltonconsultinginc.com/uploads/1/3/0/2/130289502/palesov_powobadumuzoku_xaguxakak_lavitaru.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006fc8.bin` `f1368cb701112f32d2bbc30da966bb8e36d0cf9599e3cab37d9d8d7c1735d427`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FC8	8884 bytes
`font_01_sfnt_off00009052.bin` `e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9052	2652 bytes

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