PDF malware analysis — malicious · 8f1832dfefd2f14c

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 13:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4fa1c33c8d1ac89a92c8073690553bed SHA-1: d879c991674b8fb5530cf5979fb98acc01e51c02 SHA-256: 8f1832dfefd2f14c96dc57863c042aba5791be61eb8bdf0b35636026052f47d3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms or host other PDF files, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

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
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=iphone+vs+android+for+gaming PDF link annotation
- https://majorsagilekvaros.hu/uploads/file/kasewo.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01de642b5---tifinapodidomewa.pdfIn PDF document text
- http://tajesink.com/Uploadfiles/files/68525831584.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/famizorarigebeluxa.pdfIn PDF document text
- https://aznamaste.com/ckfinder/userfiles/files/wuguwaxiwal.pdfIn PDF document text
- http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/pelironazixude.pdfIn PDF document text
- http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/38925686975.pdfIn PDF document text
- https://yourdentist.ro/app/webroot/files/userfiles/files/sarig.pdfIn PDF document text
- https://democv.associasuite.com/imagenes/contenidos/files/5765356547.pdfIn PDF document text
- http://wjcopy.com/upload/files/keledopidile.pdfIn PDF document text
- http://www.kigimex.com.vn/ckfinder/userfiles/files/wapofezedimikejuzu.pdfIn PDF document text
- http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89928605298.pdfIn PDF document text
- http://jpind.pl/userfiles/file/dekulata.pdfIn PDF document text
- https://baoyi-chuck.com/ckfinder/userfiles/files/bezulenugose.pdfIn PDF document text
- http://autovoda.ru/upload/files/65750458321.pdfIn PDF document text
- http://arisutour.com/ckupload/files/kiwusazugopizasuw.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/bisitusevij.pdfIn PDF document text
- https://mondoaudio.it/img/uploaded/file/feliganuzutexe.pdfIn PDF document text
- http://ichieh.tw/uploads/files/202109120809047239.pdfIn PDF document text
- http://zbraneklapka.cz/ckfinder/userfiles/files/76224136137.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bikiwikidujujorejalumeb.pdfIn PDF document text
- https://eminencesolutions.in/resources/userfiles/file/61588194021.pdfIn PDF document text
- http://origo.ws/userfiles/file/kewoxipaxezuxedojaronajo.pdfIn PDF document text
- http://csc0898.com/userfiles/file/20210904054430_y37pyu.pdfIn PDF document text
- http://bn-biz.com/userData/board/file/71260381455.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_off0000b8ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d0c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0C0	16452 bytes
SHA-256: `279d427b58e77f5eb69ff435085fa885166af887a2af2af356ee08c684a86d71`
`font_02_sfnt_off0000faa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAA3	10816 bytes
SHA-256: `1690381c2c7d8120615158d75cb6e13ad5ed8fc8f5b55c6b857737077f5319b1`

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