PDF malware analysis — malicious · ac805e1f2a5a547a

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 17:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 58b6064bcd3174c17d1620786ac28f65 SHA-1: 7baae38d8fb3036a1db9a256953279f82ae8721d SHA-256: ac805e1f2a5a547a9548639f9bec9f272fff06f482bd38e1f10afd6fc3d745b2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 4

Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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 https://nomylo.ru/uplcv?utm_term=voice+reminder+for+android PDF link annotation
- https://educationindiajournal.org/ckfinder/userfiles/files/jofijaxovefiwiviziweb.pdfIn PDF document text
- http://naturalwonders.com/uploads/files/15593866883.pdfIn PDF document text
- http://consulcongress.it/uploads/assets/file/suxevewasibetofo.pdfIn PDF document text
- http://onlinepravenconsultant.com/uploads/wysiwyg/files/jaxeremavexilikubizibami.pdfIn PDF document text
- https://vyrukrc.lt/userfiles/file/20075870531.pdfIn PDF document text
- http://brunagabriele.it/userfiles/files/49445240109.pdfIn PDF document text
- http://freewest.at/79789073243.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/22123382463.pdfIn PDF document text
- http://ranczowdolinie.com/files/jinukepexonojixubovusubib.pdfIn PDF document text
- http://farmaciacogliate.it/userfiles/files/2960052744.pdfIn PDF document text
- http://superfishinglewood.com/uploads/files/3080555570.pdfIn PDF document text
- http://uni-farm.pl/ckfinder/userfiles/files/35370147185.pdfIn PDF document text
- https://szabobuszrendeles.hu/files/files/gudilaxigakilud.pdfIn PDF document text
- http://nissanotogovap.vn/uploads/images/files/69651488858.pdfIn PDF document text
- http://xn--2osv9pt2jfpt.com/uploadfiles/files/gajusiguzofatejutaro.pdfIn PDF document text
- https://pmfegypt.com/userfiles/files/67261591868.pdfIn PDF document text
- http://daimarconstrucciones.com/images/admin/file/80767107014.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfea9af07---9090765265.pdfIn PDF document text
- http://dyglas.com/userData/board/file/26822529478.pdfIn PDF document text
- http://edmo-cars.nl/images/file/gegeferorotugarabe.pdfIn PDF document text
- http://quatangsongvan.com/hinhanh_fckeditor/file/22730109848.pdfIn PDF document text
- http://dijladentalcenter-qa.com/userfiles/file/jupatinefunosumoxebagupi.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB496	18152 bytes
SHA-256: `73b73240614ce35da411d0679b7a5a80970f3fa0b7bda0395402722b80dafd2d`
`font_01_sfnt_off0000e309.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE309	10292 bytes
SHA-256: `944f839ad2dc66cd7fa9325af20248590c0fb8aeb8a02a95774b5e085246effd`
`font_02_sfnt_off0000fa2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA2D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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