PDF malware analysis — malicious · b83a1a2021ba53ee

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 07:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 44bae1d6b27de67d37c371cfab677f59 SHA-1: 18c29eecd5ddf00b6db9a3b2a564a531c3fe9375 SHA-256: b83a1a2021ba53eeb3493c23864e4cae869ae5e8b2951c751f86dea52cbfa08a

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.5690

Heuristics 4

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.
External URI info PDF_URI

PDF contains an external URL action
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://wastran.ru/uplcv?utm_term=how+to+make+whatsapp+backup+android PDF link annotation
- http://bonfiremadigan.com/uploads/fckeditor/file/59344251362.pdfIn PDF document text
- http://kennycojewelry.com/userfiles/files/202109/1630857779.pdfIn PDF document text
- http://gasthaus-steinkirchen.de/img/editor/file/85679607256.pdfIn PDF document text
- http://it-hair.com/userfiles/75151024025.pdfIn PDF document text
- http://prefinancovaniehypoteky.sk/res/file/21798753893.pdfIn PDF document text
- https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/mixivi.pdfIn PDF document text
- https://egc.ecrom.work/syo/files/patumugasid.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
- https://cobrawire.com/userfiles/files/59015304094.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/ginug.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/xejewegutoxedaxifotipik.pdfIn PDF document text
- http://themadthinker.com/temp/vinney/HTML/userfiles/file/nobojubuvawakororudesu.pdfIn PDF document text
- https://hahapediatric.com/uploads/files/202109050954224465.pdfIn PDF document text
- http://immodraft.nrw/images/architekten_agentur_images_/file/79782015435.pdfIn PDF document text
- http://studiomilano.eu/userfiles/files/32257273251.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f631a4657f5c24f1add6e5bae8e52710/dopon.pdfIn PDF document text
- https://vnjhanoi.com/upload/files/93597010876.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/26375987829.pdfIn PDF document text
- http://tischlerei-schlusche.de/sites/default/files/file/57979617327.pdfIn PDF document text
- https://mimpishiodua.com/contents/files/guzovopi.pdfIn PDF document text
- http://nj-rshb.com/v15/Upload/file/202199128261655.pdfIn PDF document text
- https://tatsolarlight.com/uploads/files/piganizenelif.pdfIn 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_off0000e41f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE41F	11144 bytes
SHA-256: `683890598fcd60fe91c2d552cd4a34c667f40a707ac8a28611e45419d93a2cd6`
`font_01_sfnt_off0000fdbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDBE	16816 bytes
SHA-256: `790d8559b20b78738af223a0105c98ad3eb11192fc0265a9ec6bae414c1aa8fb`
`font_02_sfnt_off0001297a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1297A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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