PDF malware analysis — malicious · 4cdaea80bff027f8

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 20:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 7a0f13181a1e6df0cde977c9d840b881 SHA-1: 499a5fbd0b01f30066185d26ea84ae3cccc9f2af SHA-256: 4cdaea80bff027f8340bbd1bfc84878c2ae4129725b09aa69c49fdb6c04c6482

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The PDF document body was heavily obfuscated, but the presence of embedded JS and numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The technique T1566.001 (Spearphishing Attachment) is inferred due to the nature of malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9929

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://oniceh.ru/uplcv?utm_term=suoni+notifiche+android+download PDF link annotation
- http://resortvillairene.it/userfiles/files/kokavemajetofisepa.pdfIn PDF document text
- http://www.ishvani.com/www/js/ckfinder/userfiles/files/nelekujavejaj.pdfIn PDF document text
- http://vodova51-53.cz/files/25787742398.pdfIn PDF document text
- http://cmtdental.com/upload/ckimg/files/99562401929.pdfIn PDF document text
- http://citescolairedeledit.com/include/file/rigedadunigilurim.pdfIn PDF document text
- http://amoy-art.com/Upload/file/72080496314.pdfIn PDF document text
- http://katachizu.com/img/news/files/32765944503.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/77375823816.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/zusijukitutasuk.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/65088882009.pdfIn PDF document text
- http://markasib.ru/ckfinder/userfiles/files/fexebegojewiramesuwapeku.pdfIn PDF document text
- http://professional-tuner.at/uploaded/file/17896422643.pdfIn PDF document text
- http://jngf.cn/files/file/21794934245.pdfIn PDF document text
- http://polipack.ru/content/file/jolotagamanun.pdfIn PDF document text
- https://hiperaktivite.info/userfiles/files/9972582241.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f101a5c76bf71b4bcc8d5088f0c72b21/41462967675.pdfIn PDF document text
- http://radiosalsa.fr/php/rs/filesupload/file/20974602556.pdfIn PDF document text
- https://poojaindiangrill.com/nbloom/fckuploads/file/dodolimid.pdfIn PDF document text
- http://www.rpv-drachten.nl/files/file/43839307206.pdfIn PDF document text
- https://pcetravel.com/files/file/sivaxitiwa.pdfIn PDF document text
- http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/7439163893.pdfIn PDF document text
- http://sabancilojistik.com/userfiles/file/47010821059.pdfIn PDF document text
- http://ndt-ultratech.com/files/soxosodo.pdfIn PDF document text
- http://glamour-nsk.ru/ckfinder/userfiles/files/69199935900.pdfIn PDF document text
- http://badaranquehablar.com/userfiles/files/demilegubuwira.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_off0000fe39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001164b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1164B	17400 bytes
SHA-256: `8ffbd06006271b14ef4f263dfdca0937403210a1438d90768fbfd8cb76941bcb`
`font_02_sfnt_off00014392.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14392	10664 bytes
SHA-256: `b90487f9ded3e75acf164cfd63fa12f7a7a5584a92f07a4f262deeb7a0661495`

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