PDF malware analysis — malicious · 83fdb9fa4c8f1635

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 04:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e08d7726dd5fb3ff7cb1fbdd7bf04680 SHA-1: 8fb5319a79d619444c7f651d0a7ad693e84e24e7 SHA-256: 83fdb9fa4c8f163559e46a3eda3e8b352637cbe379348af132cbd6bc1682a69c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and external links (T1190) points towards an exploit or redirection strategy, commonly seen in spearphishing attachments (T1566.001).

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://huntic.ru/uplcv?utm_term=dbt+diary+card+and+skills+coach+android PDF link annotation
- https://thediamangroup.com/_images/files/27198053078.pdfIn PDF document text
- http://dyglas.com/userData/board/file/69147266336.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327a9569684---komisilirijenejakedapiga.pdfIn PDF document text
- https://pro-biomed.com/admin/userfiles/file/22829292069.pdfIn PDF document text
- https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/pewodajudeduzukidavesazi.pdfIn PDF document text
- http://tongrentangthai.com/UserFiles/file/rabajalozitabilulul.pdfIn PDF document text
- http://globalbizkorea.com/userData/board/file/tulofimidapuwix.pdfIn PDF document text
- https://299-45.com/CKEdit/upload/files/nojunewasotej.pdfIn PDF document text
- http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boboj.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/wobal.pdfIn PDF document text
- http://abarappresentanze.it/userfiles/files/nafowonujefujoteda.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/55894246543.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef936c1e0f---16880469870.pdfIn PDF document text
- https://wolfgang-photography.com/userfiles/files/kiverawasibavudoxiwigaji.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdc9849d2---repokogazor.pdfIn PDF document text
- https://tigapilar.com/upload/files/90656066300.pdfIn PDF document text
- http://fulepmark.hu/nyebu/fulepmark/userfiles/file/71647478013.pdfIn PDF document text
- https://kujainspectors.com/candyticket/uploads/page_images/files/donezivisoziruzevelur.pdfIn PDF document text
- http://nationalcoopadvisors.com/userfiles/files/52046041357.pdfIn PDF document text
- http://nzozkrowodrza.pl/uploads/editor/file/wakarajimukobinan.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/fokugimogolizerapezowop.pdfIn PDF document text
- https://vilnius.cvzona.lt/resources/img/files/xedexutavo.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_off0000e79a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE79A	10680 bytes
SHA-256: `93dfb983a78038905e27087a7d1e7996b0ae0f769fd26d0618a1384ecbf1dd8e`
`font_01_sfnt_off00010007.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10007	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011819.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11819	17836 bytes
SHA-256: `6516d69f19cbe18448bb18abb52dd0be6c5d7d3efcab209653c395dde8585b37`

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