PDF malware analysis — malicious · 3e82100759aeeb65

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 14:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: cd777cf1c138493b5bcc1f09c7265cce SHA-1: 747fc5d7ba816fc7426b8910723da015f8e7242e SHA-256: 3e82100759aeeb658c4fffc3dc3ef8b7d9ea2c05334cc892cfe17a33933e473b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.8637

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://sarica.com.tr/ckfinder/userfiles/files/jarejilamusuniwaro.pdf In PDF document text
- https://abriganature.centralcms.cloud/galeria/files/54581425800.pdfIn PDF document text
- http://sungsam.net/userData/board/file/19108451624.pdfIn PDF document text
- http://kondicionery-fryazino.ru/upload_picture/file/4162670054.pdfIn PDF document text
- https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/30211579169.pdfIn PDF document text
- http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/rugejunakudolatumera.pdfIn PDF document text
- http://szpitalstrzelin.pl/userfiles/files/5066812575.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/54f5e9832f5755278e72acc9cd41a2c0/wobufofofowenufam.pdfIn PDF document text
- https://itscebu.com/upload/file/20210905005336.pdfIn PDF document text
- https://sainaudit.mn/File/86113865063.pdfIn PDF document text
- https://www.igescanada.com/ckfinder/userfiles/files/bepifavuw.pdfIn PDF document text
- http://baracenter.be/userfiles/file/94350715337.pdfIn PDF document text
- http://pphjako.pl/userfiles/file/pudibefer.pdfIn PDF document text
- https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdfIn PDF document text
- http://profstil.az/userfiles/file/tadevupeloxuti.pdfIn PDF document text
- http://vina2002.com/uploads/files/27743558054.pdfIn PDF document text
- http://ingore.cn/upload/files/rezifozatofodamo.pdfIn PDF document text
- https://foodexgida.com/uploads/files/mimejafiraram.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/99354709315.pdfIn PDF document text
- http://warehousetraining.ie/images/gutoposadipefapef.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/36e233412aa8bb7549059bf1185b965c/fupazazafif.pdfIn PDF document text
- http://rongqichem.com/upload/files/27825567683.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=beetv+apk+modPDF link annotation
- http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/lalivux.pdfIn 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_off0000eaa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA9	10256 bytes
SHA-256: `6c1c2f33b23545e8f4af25f96b3dab65f39c9b594f5e952b30ca3b2171016860`
`font_01_sfnt_off000101d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000119e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119E6	19516 bytes
SHA-256: `14e7d5a63204a270484efcc70efdab487c82e430da088c3060b7710d5935dcd5`

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