PDF malware analysis — malicious · 72f29949b5013267

MALICIOUS

PDF

69.3 KB Created: 2021-10-07 01:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: e5dad0a94e50aa9b5b975f1c5f949133 SHA-1: ca98ec35a7f0dc482da982120dfa5e6546e92647 SHA-256: 72f29949b50132677acaa6849e881b1347004a32498b00549582d4fe8c4dbdb2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=semiconductor+equipment+companies PDF link annotation
- http://zeshengtecphar.com/UploadFiles/FCKeditor/20210904044319.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/35584641979.pdfIn PDF document text
- http://hoitruyengiaocodocvietnam.com/uploads/image/files/tetinikof.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/47166929449.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/25856106703.pdfIn PDF document text
- http://srtprogetti.eu/userfiles/files/7703265145.pdfIn PDF document text
- http://bakineshr.az/ckfinder/userfiles/files/36063959567.pdfIn PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/11459693268.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/34269597727.pdfIn PDF document text
- https://smartcirclegroup.com/userfiles/file/gibosajize.pdfIn PDF document text
- http://snabsz.ru/ckfinder/userfiles/files/25189408157.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155dc99ac094---16408896878.pdfIn PDF document text
- https://fajanav.com/aym_image/files/38282362150.pdfIn PDF document text
- https://dakhoathienhoa.net/images/files/mapefikoroduvigizuwiza.pdfIn PDF document text
- https://kltccompany.com/ckfinder/userfiles/files/65832952564.pdfIn PDF document text
- http://stpogfzz.com/attachments/202109/editor/file/fazufegusebubefisaw.pdfIn PDF document text
- https://sandipkumardutta.com/ckfinder/userfiles/files/99337081595.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582e93e2406---70996378859.pdfIn PDF document text
- https://fetogram.com/images/upload/files/72444790253.pdfIn PDF document text
- http://usarsenal.it/userfiles/files/bogategikusefadarebiluzer.pdfIn PDF document text
- https://alkathirilaw.com/userfiles/files/puzigogeneloj.pdfIn PDF document text
- https://bishopsalamatkhokhar.org/userfiles/file/kewokoronitabesolelasipez.pdfIn PDF document text
- http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.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_off0000b28c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB28C	10948 bytes
SHA-256: `178a52d6e0ab4d92fce608ebf57c19bc0826ec37c7df16a3db0877371de694b7`
`font_01_sfnt_off0000cba9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBA9	14348 bytes
SHA-256: `5c1737363e15aa953852277afb220048af2882bf119abed7d54c32acfc5aba5a`
`font_02_sfnt_off0000ef3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF3C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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