PDF malware analysis — malicious · 8c91210564818cfd

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 10:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 341176afbed969d5dba5a8c196af7838 SHA-1: 5d25b549d268a3d7d0b409efc91c382188355182 SHA-256: 8c91210564818cfdd9c71e9cd6b56c4c0230d87513e010d19b5280a56fbf009e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, while heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://narellesastro.com/userfiles/files/werepelekakupewisegav.pdf In PDF document text
- http://cw-cut.com/uploads/file/77761354925.pdfIn PDF document text
- http://rollfactorytogo.com/uploads/files/48908977745.pdfIn PDF document text
- http://rpsbchamber.org/editorData/file/35750054486.pdfIn PDF document text
- https://asiantms.com/ckfinder/userfiles/files/42313679836.pdfIn PDF document text
- https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/suzami.pdfIn PDF document text
- http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/25400680981.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/gijufu.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d783ba7b82---35002885749.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/rilapojojolupoxuwinub.pdfIn PDF document text
- http://amongelite.com/ci/userfiles/files/4912317700.pdfIn PDF document text
- https://karolinanowak.com/userfiles/file/pexorinunukidevukawotuval.pdfIn PDF document text
- https://genia-groupe.fr/images/files/6291530848.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/96662924050.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a4319b5---mojedigadavunarip.pdfIn PDF document text
- http://kayapaliinsaat.net/file/79391309818.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/57609439428.pdfIn PDF document text
- https://digireg.se/upload/93822398686.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/dikoziwolebozatiboro.pdfIn PDF document text
- http://tochuchoinghi.org/files/95322942022.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/kawimipefikukuzevagusel.pdfIn PDF document text
- http://yujinpharma.com/upload/files/72157586087.pdfIn PDF document text
- http://bigcool.net/webroot/img/files/36794572533.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=product+rule+derivative+examplesPDF link annotation
- 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_off0000d18e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD18E	10840 bytes
SHA-256: `fabf93282ceb28fe280d7cd36fd367647d238a4ef4959b60d3d372d09c9ef4dd`
`font_01_sfnt_off0000eaa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000102ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102BA	18980 bytes
SHA-256: `f4b0b4e7d83acdedf9e536446fc4e122ca535458703c29e7ddf9c10e80137842`

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