PDF malware analysis — malicious · ae4f2d88bbe59ce8

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 21:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c0e78c91472f36e48613f71199a31d60 SHA-1: 219832c05a762be73047a6a4b41287a2857ac03e SHA-256: ae4f2d88bbe59ce8064c6ef18fc5c24dc806fa9c57a1817f6d366bbef848e8c2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate malicious intent, including a high ML score and ClamAV detection as a phishing trojan. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics suggest the primary goal is to redirect users to potentially malicious external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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 http://sun-green.nl/ckfinder/userfiles/files/sogevumifovuniwufot.pdf In PDF document text
- http://freeski.hu/freeski/file/34093772579.pdfIn PDF document text
- http://ncdesign.it/userfiles/files/16499986580.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/raroxilejifijufogarebo.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffa24c539---52249296391.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a59f13082---lipixebaxupoxad.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/pafeviw.pdfIn PDF document text
- http://centrlita.ru/archive/image/file/74971843970.pdfIn PDF document text
- https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/9150703156.pdfIn PDF document text
- https://u-spot.biz/js/ckfinder/userfiles/files/lilemejevozivaweberolek.pdfIn PDF document text
- https://eghamatyab.com/basefile/bainbookcom/files/kopimivevab.pdfIn PDF document text
- https://genia-groupe.fr/images/files/sibewenis.pdfIn PDF document text
- http://prosefkuchare.cz/userfiles/60186736217.pdfIn PDF document text
- http://519pf.com/userfiles/files/58243511434.pdfIn PDF document text
- http://insightonafrica.in/userfiles/file/55328584986.pdfIn PDF document text
- http://sinosteelcode.com/filespath/files/20210920042046.pdfIn PDF document text
- http://pn-tech.net/userData/board/file/77400659938.pdfIn PDF document text
- http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gobetodep.pdfIn PDF document text
- http://slxiang.com/v15/Upload/file/20219817711129.pdfIn PDF document text
- https://qfuse.it/images/uploaded_files/ckfinder/files/1631850451_bfef4923f1.pdfIn PDF document text
- http://sxhk365.com/uploads/file///40839574733.pdfIn PDF document text
- http://hillcrestneighborhoods.com/userimages/polarerovolimazidesikukaw.pdfIn PDF document text
- http://rymwid-training.com/userfiles/file/lelifukemek.pdfIn PDF document text
- http://myucmas.com/userfiles/file/ruzelukupakifibob.pdfIn PDF document text
- http://modelseafarm.com/kweb/ckfinder/userfiles/files/lazujajivapofen.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=share+internet+via+bluetooth+androidPDF 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_off0000e777.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE777	18132 bytes
SHA-256: `a6f904a3f80e0f812aac87ed4cbd555ab51fa9421b1954a5e6c4a0a75caf402b`
`font_01_sfnt_off00011616.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11616	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E2D	10560 bytes
SHA-256: `b7eb1fa5d6b3a5bfdde3b3d795648b8393452ca90e0c54385f84342237da7ddf`

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