PDF malware analysis — malicious · 9c1bd05f5d778f47

MALICIOUS

PDF

90.0 KB Created: 2021-09-18 02:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: ca913daa25b7695aae01604eef31381e SHA-1: 144321cb028f434402d806150863e9679cf0aa62 SHA-256: 9c1bd05f5d778f47debda37add417345fab110554f5e3f493527deb3112395d3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF also contains a large number of links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://bestcaps99.com/ckfinder/userfiles/files/foperuvixaliwoke.pdf In PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6b5fbf60ec143b573e05621647f0e9c4/94410215442.pdfIn PDF document text
- https://www.khaosanpools.org/ckfinder/userfiles/files/44962232721.pdfIn PDF document text
- http://aydinservis.com/ckfinder/userfiles/files/57519769461.pdfIn PDF document text
- https://esperanzadeavila.com/fotos/file/9055101723.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/87534307224.pdfIn PDF document text
- http://kmconlinecme.com/userfiles/file/41127462557.pdfIn PDF document text
- http://mybyblos.com/userfiles/file/64571876215.pdfIn PDF document text
- https://ganport.pl/userfiles/file/nozazinazu.pdfIn PDF document text
- https://www.rapn.ru/ckfinder/userfiles/files/fefawalaz.pdfIn PDF document text
- http://japhina.com/upload/file/87177300284.pdfIn PDF document text
- http://maezawa-jidousha.com/js/upload/files/51604611723.pdfIn PDF document text
- http://autoneza.cz/UserFiles/File/lotasizumigapovemuv.pdfIn PDF document text
- https://safarekhoob.ir/basefile/safarekhoobir/files/jamuwusebepifegasokubuz.pdfIn PDF document text
- http://cw-cut.com/uploads/file/xabetezuloxupawuzune.pdfIn PDF document text
- https://skyzoan.com/cake/beta/userfiles/file/gowunefuwa.pdfIn PDF document text
- http://belstroyiz.ru/img/file/69279612630.pdfIn PDF document text
- http://bbdecontra.com/userfiles/files/12618543791.pdfIn PDF document text
- https://justforjetscatering.com/userfiles/image/files/89320980712.pdfIn PDF document text
- http://prodottoitalia.eu/userfiles/files/73888444831.pdfIn PDF document text
- http://rheumatology.institute/upload/content/file/nolun.pdfIn PDF document text
- http://yjccnc.com/upload/files/migisevolagorinasos.pdfIn PDF document text
- http://tottazo.com/userfiles/file/82339641253.pdfIn PDF document text
- http://crescentcarpets.com/userfiles/file/96210596726.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=think+student%27s+book+3+pdfPDF 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_off0000fc4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC4D	17412 bytes
SHA-256: `1c44370422d833d48fdfb2bc8c3bed9bbfb4d28971bd6e49ddcc2ebde58d94b2`
`font_01_sfnt_off0001292f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1292F	10788 bytes
SHA-256: `af1d8d6d1ba6501cd4a70c9f1b7cc941db459d625d7b6ee1818a495540362559`
`font_02_sfnt_off000141d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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