PDF malware analysis — malicious · 256042a68f3cd13c

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ac943c1f76da2158fbef534e8a8806be SHA-1: f8ce4b702d8bd148b74a3ad595c22937e9abf35e SHA-256: 256042a68f3cd13c1e8cc525b438536849bac433dc498313ecd9f4a877d0e58a

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution campaign. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack where the user is instructed to open a password-protected archive, likely containing the actual payload. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://smidgel.ru/uplcv?utm_term=android+fonts+installieren PDF link annotation
- https://marjoyunlar.com/calisma2/files/uploads/71223890784.pdfIn PDF document text
- http://fixafilm.se/userfiles/file/nafizakevovoxel.pdfIn PDF document text
- http://ptichile.cl/userfiles/file/62668831674.pdfIn PDF document text
- http://fantasymusic.it/userfiles/files/pokeja.pdfIn PDF document text
- https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/renizizimo.pdfIn PDF document text
- http://neza.cz/UserFiles/File/navelawapivaxojiderixabiz.pdfIn PDF document text
- http://superlitefan.com/uploads/files/tijumifuvilutaroborana.pdfIn PDF document text
- https://heks-tech.com/app/webroot/userfiles/files/40336017610.pdfIn PDF document text
- http://uslugi-ogrodnicze.pl/pliki/File/49490959093.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wunulepozenenajubuvuraz.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/66652874305.pdfIn PDF document text
- http://lokalizacja-gps.pl/userfiles/file/85604578676.pdfIn PDF document text
- https://moulindelarroque.com/userfiles/file/gafotuvazofubodijezeri.pdfIn PDF document text
- http://yogaschoolofkerala.com/photos/editor/files/24166125688.pdfIn PDF document text
- https://gemma.lucien-sv.info/uploads/files/612fa6b97c018.pdfIn PDF document text
- http://dishandspoonproductions.com/ckfinder/userfiles/files/monevonosuvuzuf.pdfIn PDF document text
- http://changrung.com/ckfinder/userfiles/files/8627337106.pdfIn PDF document text
- https://mintedimages.com/ckfinder/userfiles/files/jubowixegodopulusemur.pdfIn PDF document text
- https://thietkewebseo.com/webroot/img/files/74629722232.pdfIn PDF document text
- http://worldsocialistpartyindia.org/ckfinder/userfiles/files/63614117095.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/roduzigajutaz.pdfIn PDF document text
- https://francois-daulte.com/ckfinder/userfiles/files/mivisamesikurasapum.pdfIn PDF document text
- https://tdfstore.it/file/51508871415.pdfIn PDF document text
- 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_off0000e643.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE643	10328 bytes
SHA-256: `d967cad6334e3ee88a092b6cc7853fe9b45c4fc2c8290f72ae1e1a601ea3acef`
`font_01_sfnt_off0000fdab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDAB	18012 bytes
SHA-256: `fb5836e61be67fc3e3a42b1f45b84fb91a3d82e6d66ab5c9dc4282825653f33e`
`font_02_sfnt_off00012cf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CF1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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