PDF malware analysis — malicious · 5abb04ac3dea5b25

MALICIOUS

PDF

44.6 KB Created: 2020-03-29 22:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 9e1bdc58f947dcbde2131f61aad53974 SHA-1: 54a2546baa4d5e91b9bdd7892cd791be3985abf0 SHA-256: 5abb04ac3dea5b255ff823a950256820564f9b2fcba47184d52188578e55a73e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs with numeric slugs, indicative of a link farm. The primary URL, http://bauerhomemakerservices.com/uploads/1/3/0/6/130622027/130622027.html#c%C3%B3mo+se+dice+el+4000+en+ingl%C3%A9s+cu%C3%A1ntos+a%C3%B1os+tienes, appears to be a lure to engage the user. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://bauerhomemakerservices.com/uploads/1/3/0/6/130622027/130622027.html#c%C3%B3mo+se+dice+el+4000+en+ingl%C3%A9s+cu%C3%A1ntos+a%C3%B1os+tienes
- http://vocescuola.org/uploads/1/3/0/9/130969291/5559854.pdf
- http://guitarporno.com/uploads/1/3/0/5/130588567/b0caa7bb46a4e.pdf
- http://paulcurryelectrics.com/uploads/1/3/0/5/130551094/65e588.pdf
- http://azviptransport.com/uploads/1/3/0/8/130874478/tozabifivized_wagakiziluguwu_tewevisavawu_jelofibixefel.pdf
- http://my-spiritual-garden.net/uploads/1/3/0/5/130543837/2496746.pdf
- http://blackswanpremium.com/uploads/1/3/0/2/130287815/a5d2ff24.pdf
- http://amangelcare.com/uploads/1/3/0/6/130621201/lovovotokiwo_lekebubinadosev_xoziwoti.pdf
- http://ribinsurance.wales/uploads/1/3/0/6/130604016/kinesu_rawazupe_levifibete_noxutola.pdf
- http://g82films.org/uploads/1/3/0/8/130874115/vawefap_pedus.pdf
- http://wallaroostoragesolutions.com/uploads/1/3/0/5/130588529/pibenuvugil.pdf
- http://termdirect.com/uploads/1/3/0/7/130776027/puruvem.pdf
- http://theoptimusgroup.net/uploads/1/3/0/4/130483737/9007369.pdf
- http://tangercarrental.com/uploads/1/3/0/5/130551095/nebelepofeduvuf.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_off00006a15.bin` `ce53aace463ae37e0708e32c89f866c4e908b9c2ec73a49756dc31efeea3dc91`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A15	9384 bytes
`font_01_sfnt_off00008c24.bin` `74e845d9612d2ba7dd58b218b9691f198cac6699528c6ecad57b98cb46d1cf60`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C24	16284 bytes

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