PDF malware analysis — malicious · 5bae4dd6d9847bf5

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 375f1ff24339c1759f37f6f6f8feca5d SHA-1: 3aa190545518b9ba438b950b83f924eb00c98c01 SHA-256: 5bae4dd6d9847bf59ae60279641caaf913d1be913b2cfda5366380b8935f17b7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and the presence of numerous external URIs suggests a redirection to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

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.
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://ulv-fogger.es/d/files/49618025694.pdf In PDF document text
- https://egyseg.eu/ckfinder/userfiles/files/fuwadonidasarazo.pdfIn PDF document text
- http://araonline.hu/uploads/file/13879585797.pdfIn PDF document text
- http://hublihorse.com/uploads/userfiles/files/rikowazigomigavujawuvoga.pdfIn PDF document text
- http://papinchess.ru/userfiles/file/10381355197.pdfIn PDF document text
- http://hycxchina.com/filespath/files/20210905002522.pdfIn PDF document text
- http://bhttourist.com/upload/fckimagesfile/filokuxemudetomem.pdfIn PDF document text
- http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/44422571311.pdfIn PDF document text
- http://falegnameriacastiglione.it/userfiles/files/dejejaremasodevu.pdfIn PDF document text
- https://strategie-forex.com/ckfinder/userfiles/files/fonivojerevobajivebalapa.pdfIn PDF document text
- http://lovec.bg/root/ckfinder/userfiles/files/37943204689.pdfIn PDF document text
- http://cngwalk.com/fckeditor/userfiles/image/gaworazoti.pdfIn PDF document text
- http://milkyway-vn.com/upload/files/29912841007.pdfIn PDF document text
- http://geredekombiservisi.com/userfiles/file/41283238298.pdfIn PDF document text
- https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/40879968866.pdfIn PDF document text
- http://vzwsportenmuziek.com/content_docs/sabixawinomaze.pdfIn PDF document text
- http://synthecinter.com/userfiles/files/98574647803.pdfIn PDF document text
- http://hpworld.hu/data/pic/Image/file/10695181910.pdfIn PDF document text
- http://sp2wronki.pl/fotki/fotki/file/13484982052.pdfIn PDF document text
- http://hwayinn.com/image/files/20210913_050418.pdfIn PDF document text
- http://ibookingkr.com/FileData/ckfinder/files/20210911_12FF1F5228A2AFFC.pdfIn PDF document text
- http://longarmquiltingacadamy.com/fckeditor/userfiles/file/bukedoz.pdfIn PDF document text
- http://seyrimerdin.com/userfiles/file/84475331944.pdfIn PDF document text
- http://piannocreativo.com/js/new/fckeditor/userfiles/file/57468757497.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ac+market+pcPDF 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_off0000dfdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFDC	10076 bytes
SHA-256: `62b78aa0d2b3ba2541444bafc7625b43149a502e8e593c9126d02fab323089c4`
`font_01_sfnt_off0000f65b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF65B	18084 bytes
SHA-256: `4b5c1c391040eafa4d88affe328d0e4c491c9b5a9dbc2c6be2bd50042ea84611`
`font_02_sfnt_off00012567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12567	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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