PDF malware analysis — malicious · 490fa51266e7628d

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 12:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 21286e2d4bcbabba913d46c84f784685 SHA-1: f336cc1d77adb9e6314889e3677cc7cb2eb59523 SHA-256: 490fa51266e7628d992b73128841614754a1975c1e9c672773dbdc719ceeddd4

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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the embedded JavaScript likely redirects to a collection of disposable domains hosting further PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://wedding-box100.com/uploads/files/202109101644322589.pdf In PDF document text
- http://tgtech-auto.com/userfiles/file/nogopak.pdfIn PDF document text
- http://korealabels.com/ckfinder/userfiles/files/75911441898.pdfIn PDF document text
- http://sungwoo-n.com/userfiles/file/84378083145.pdfIn PDF document text
- http://sissonne.hu/editor_up/dunaposerasomakilujajexos.pdfIn PDF document text
- https://economiadecomunion.net/ckfinder/userfiles/files/givikowogejolimikidata.pdfIn PDF document text
- http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibarisinixubirapixofa.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/63782710479.pdfIn PDF document text
- http://www.barbazan-debat.fr/ckfinder/userfiles/files/riwufijopakapituwozivij.pdfIn PDF document text
- http://modernplating.com/userfiles/file/87985042383.pdfIn PDF document text
- https://bayihoki99.com/contents/files/48161352217.pdfIn PDF document text
- https://atlanticcompact.org/userfiles/files/84066741453.pdfIn PDF document text
- http://eg-connect.com/uploads/editorfiles/file///54679772463.pdfIn PDF document text
- http://m-camper.ru/ckfinder/userfiles/files/55652089123.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/26674710040.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161429e32751c4---90154212707.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/jatunivofisexuwen.pdfIn PDF document text
- http://pravkniga.ru/files/userfiles/files/58979204111.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/nebijalapuwutenufuzuxa.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/671f99692e32e8fa3c6fd6206dd1fa87/fadux.pdfIn PDF document text
- http://fmmvn.net/userfiles/files/kalexajejavexumasetenozej.pdfIn PDF document text
- https://dp-silver.com/userfiles/file/51588613705.pdfIn PDF document text
- http://beccaro.it/userfiles/files/remukiruxabemebaduroku.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=super+scratch+programming+adventure+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_off0000d940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD940	18328 bytes
SHA-256: `3e3709cd7de16dce8b53885481be979c6adb49e6b1093f1a8edae35cc484e5f0`
`font_01_sfnt_off0001095b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1095B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012172.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12172	11264 bytes
SHA-256: `215e79220fae65cf943c0e3a16700ac8b457938e2865257b324fee1fe3d7f3d9`

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