PDF malware analysis — malicious · 6558700128daa3eb

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 10:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 548f78ab9744b2f679cefd49e34ae750 SHA-1: f0c86d9d9f7054b8d028e2dff32f8dcb7510038b SHA-256: 6558700128daa3ebd330581c45890e4e9423d27c9bfcfcf494bdff325d846534

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs. The primary purpose seems to be directing users to potentially malicious or phishing websites.

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://medvor.ru/uplcv?utm_term=galaxy+s21+vs+iphone+12+pro+camera PDF link annotation
- http://svenskafik.se/uploads/fckeditor/file/23693384096.pdfIn PDF document text
- http://mixmarketing.vn/upload/fck/file/koziv.pdfIn PDF document text
- http://xprchemical.com/upload/files/kupumeteb.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece0b3223a---95815740569.pdfIn PDF document text
- http://vidol.eu/userfiles/file/65662964497.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1722eb12---14780542898.pdfIn PDF document text
- http://madiagranitosilano.it/userfiles/files/2061238492.pdfIn PDF document text
- https://akemi.ro/hirek/file/91717296930.pdfIn PDF document text
- http://skidubravy.sk/spravca/ckfinder/userfiles/files/5583047083.pdfIn PDF document text
- https://vietrocknet.org/app/webroot/img/files/nemiva.pdfIn PDF document text
- http://hoadon-dientu.net/images/files/minemototivakaw.pdfIn PDF document text
- https://ecohort.biz/userfiles/files/3806266275.pdfIn PDF document text
- https://securitydm.com/slicice/file/jusivalaf.pdfIn PDF document text
- http://vektor-bezpeki.com/userfiles/files/50670555671.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210902123832_mryy93.pdfIn PDF document text
- http://wych123.com/upload/files/54549575605.pdfIn PDF document text
- https://iwanbim.iwan.co/userfiles/files/24168394560.pdfIn PDF document text
- http://klusjesindex.nl/images/uploads/vevunomojes.pdfIn PDF document text
- http://c-six.it/userfiles/files/34554581803.pdfIn PDF document text
- https://mclandpin.com/calisma2/files/uploads/89266930940.pdfIn PDF document text
- https://krossi.ru/images/content/files/giferesebukafutemasudan.pdfIn PDF document text
- http://f-kcc.jp/user_data/userfiles/files/42054438281.pdfIn PDF document text
- https://ms02bet.net/contents/files/32337976978.pdfIn PDF document text
- https://kisikana.hr/UserFiles/files/64972708484.pdfIn PDF document text
- https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/buzodeperi.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_off0000b717.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB717	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cf2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF2E	11036 bytes
SHA-256: `23ae8d4ea46249107daa34e5ce5a4a00fee8bcab8c37a42ac6cdf42968067056`
`font_02_sfnt_off0000e8cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8CD	16180 bytes
SHA-256: `aee162031cb7cfda21340270fac387c9b1be2185d49087d91901f2a1ab798db3`

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