PDF malware analysis — malicious · fbf0d23d6fb51052

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 08:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9279fce882f0cbac48960569a96a25e8 SHA-1: 79cf9a68b43e54337538f2b421eb6686b39af74a SHA-256: fbf0d23d6fb51052bc99d2e69789b5e522d57b5de528932da755184c403def19

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of many external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 http://scard.vn/app/webroot/uploads/files/77328514496.pdf In PDF document text
- http://rajskiewakacje.pl/userfiles/file/36027322450.pdfIn PDF document text
- http://urs-certification.com/gais/image/file/41495162494.pdfIn PDF document text
- https://ijtm.in/userfiles/file/18225037137.pdfIn PDF document text
- http://enjoyisagenix.com/ckfinder/userfiles/files/xenaxikofisabopevaje.pdfIn PDF document text
- http://architettoseneca.com/userfiles/files/xomufotojajidodibejeza.pdfIn PDF document text
- https://producto.works/userfiles/file/98298663235.pdfIn PDF document text
- https://ceramicasvillaflor.cl/UserFiles/File/ronefuv.pdfIn PDF document text
- http://gccde.com/downloads/blog/geust/files/zemejinubovapevogonu.pdfIn PDF document text
- http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivevebelaxe.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/84958793210.pdfIn PDF document text
- https://sarenpinler.com/calisma2/files/uploads/13481654067.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f2334aec8---zesezilisipovorowil.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/vivebuwamuxavegevar.pdfIn PDF document text
- http://nowyhotelik.pl/userfiles/file/77395265208.pdfIn PDF document text
- https://hyosung-gulf.com/uploads/file/daresekusepojit.pdfIn PDF document text
- https://safarekhoob.ir/basefile/safarekhoobir/files/5031569067.pdfIn PDF document text
- http://engineersclasses4competition.com/files/others/jijosidize.pdfIn PDF document text
- http://www.clc-engineering.com/siteuploads/editorimg/file/67808761725.pdfIn PDF document text
- http://xedaptheduc.net/app/webroot/uploads/files/77258560906.pdfIn PDF document text
- http://ieltsadd.ir/cache/fck_files/file/dogotajemawapefelodelofi.pdfIn PDF document text
- http://madinagirls.com/easydo%20v2.00/files/uploads/fubulejit.pdfIn PDF document text
- http://urparitet.ru/admin/ckfinder/userfiles/files/18932686059.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05507807e---49461307103.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+9+power+is+good+for+gamingPDF 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_off0000dc9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC9B	10996 bytes
SHA-256: `e61e51435cc87c57818cd4a46233adef0ff992eda4c27672295cf505c46d153b`
`font_01_sfnt_off0000f5fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5FB	18048 bytes
SHA-256: `a1ecef8e8e2bf9db6315c1521353a8b6c29f3799efb8b0564ac3f87928d88784`
`font_02_sfnt_off000124db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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