PDF malware analysis — malicious · d4678d4bbe89847a

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 215013e61b89d537ae127a3c2889cb10 SHA-1: b5596c4ed2d0ad28ed0e67ab26488bba869e2cd3 SHA-256: d4678d4bbe89847ab39c9789adbac80afda2b4bac151759310cd4af08688be19

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to trick users into downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://coretry.ru/uplcv?utm_term=vidmate+app+download+install+old+version+xcmrd+apk+download PDF link annotation
- http://robfredo.com/userfiles/file/63333253088.pdfIn PDF document text
- http://ekopaczka.pl/imgbrama/files/xuvagedadesapiw.pdfIn PDF document text
- http://dogoducthien.com/uploads/files/perowuzizezurasazin.pdfIn PDF document text
- http://lavalnerina.it/userfiles/file/zupukopofejojozonizizip.pdfIn PDF document text
- http://france-ex.com/images/blog/file/benunifujipolusebam.pdfIn PDF document text
- http://tieclangman.com/Images_upload/files/29610537315.pdfIn PDF document text
- http://kukubara.com/zdjecia/file/17722194237.pdfIn PDF document text
- http://classicalgardenstatues.com/uplds/file/gibirikuvevejujozi.pdfIn PDF document text
- http://onelove.cz/file/soluzonetowufarud.pdfIn PDF document text
- http://jonme.net/ckupload/files/supinukoridanakatapirezug.pdfIn PDF document text
- http://vietdubai.com/userfiles/file/13131514778.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7038576b---wenifowawunetoliza.pdfIn PDF document text
- http://ydchem.cn/filespath/files/20210913115759.pdfIn PDF document text
- https://maciejabramowicz.pl/upload/files/file/9814598134.pdfIn PDF document text
- http://kleinschadenexpert.de/userfiles/file/83572842594.pdfIn PDF document text
- http://tjjjsh.com/uploads/files/20866080559.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a75de0789---pizuwesulujaputokew.pdfIn PDF document text
- https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tijoxitowum.pdfIn PDF document text
- https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/wogowitoxaf.pdfIn PDF document text
- https://quatden.vn/webroot/img/files/jepijerezarizapatoreto.pdfIn PDF document text
- https://bongkartuantakur.com/contents/files/navulo.pdfIn PDF document text
- http://zvaracskaskola.eu/editor_uploads/system/files/bibigulaxorebumokutokeme.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_off0000efd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107E3	16844 bytes
SHA-256: `d65c534754eae0d9ffa753d7cec1d224f5b868b47d9ef672fa5c32b65f293e83`
`font_02_sfnt_off0001332e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1332E	10992 bytes
SHA-256: `7b87bc2fcf98d523501b99519cd6adcf17569daa5784bf65f1ac9ef0c2813eb7`

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