PDF malware analysis — malicious · 2d11ae5e28e93552

MALICIOUS

PDF

39.3 KB Created: 2020-05-16 02:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 11f54b7ea055ab802d0de47ce44a1c4c SHA-1: 0fad0b4ed94970c3cb796474281ab17b0395a06e SHA-256: 2d11ae5e28e935523062dc69d902e43f790e8e4537fcdbb2a8ead2a7a4548060

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Sembulingam physiology book free' and references the wkhtmltopdf tool, suggesting a lure for search engine optimization or to distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious purposes, likely SEO spam or hosting malicious content.

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://beaverdamchurchonline.org/uploads/1/3/0/5/130550712/130550712.html#sembulingam+physiology+book+free
- http://easynailswithdawn.com/uploads/1/3/0/8/130814310/deves.pdf
- http://waybeau.org/uploads/1/3/1/4/131438096/5dbd6.pdf
- http://rainbowofgreenville.com/uploads/1/3/0/6/130620370/buveto.pdf
- http://maxzubatsky.info/uploads/1/3/0/7/130775808/6406fbbe9d.pdf
- http://wildernesshomeinspection.com/uploads/1/3/0/4/130483385/sunir.pdf
- http://iwallpaperexperts.com/uploads/1/3/0/5/130538995/5317551.pdf
- http://healthcarecareercoaching.com/uploads/1/3/1/8/131856316/e040f1.pdf
- http://the-hotel-academy.com/uploads/1/3/0/9/130969353/gifelakubimagos_biwidutono_resibupixebani_gobeladifizi.pdf
- http://prime-autocare.com/uploads/1/3/1/3/131380299/8003401.pdf
- http://hudsonhoneyco.com/uploads/1/3/1/4/131483253/wagegakefogepa.pdf
- http://back2businessconsulting.com/uploads/1/3/1/1/131163983/vonozaletadiz.pdf
- http://rachsrm.com/uploads/1/3/0/2/130272548/1981770.pdf
- http://baselabstudios.com/uploads/1/3/1/4/131411474/lagalakomu.pdf
- http://theatreboreal.org/uploads/1/3/0/3/130312919/puzoxikexixupe_jatepo.pdf
- http://susmitapaul.com/uploads/1/3/0/6/130639607/a54876d0929.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_off00005a2a.bin` `757160b9203c9009beae6abbd9e284fb270c6268eb3145e83b36d6dd35dd9423`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A2A	10120 bytes
`font_01_sfnt_off00007cd9.bin` `4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7CD9	16060 bytes

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