PDF malware analysis — malicious · 4d6b18394b196db1

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 06:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 994575b6414d3f14269c07064faf5e89 SHA-1: c3c2c5fbbcbfa368b59b52674157ec3947bfed83 SHA-256: 4d6b18394b196db1358838212ecd67ae5013bbe4662316a3b15e8a7373686ac2

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques commonly used for delivering malicious content or redirecting users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 5

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.
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://medvor.ru/uplcv?utm_term=photorec+android+phone PDF link annotation
- http://kozelskadm.ru/files/uploads/files/wulevefigomumotafulikizu.pdfIn PDF document text
- http://resumesfromabove.com/userfiles/file/74045976085.pdfIn PDF document text
- http://isspskola.lv/userfiles/files/vofagilutawesodugiko.pdfIn PDF document text
- http://realtor-madrid.com/uploades/fckeditorfile/jiresamelegitoveruxan.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/84182308787.pdfIn PDF document text
- http://hcvitamin.com/webroot/img/files/fukifobifurokilimisepivob.pdfIn PDF document text
- http://mygotour.com/FileData/ckfinder/files/20210911_FEB51D5EEF217D82.pdfIn PDF document text
- https://ms02bet.com/contents/files/9507277733.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad3501c977---98068195546.pdfIn PDF document text
- http://sjanzee.nl/file/vibodidototiboxoriniki.pdfIn PDF document text
- http://xn--aknmedical-yub.com/uploads/file/vanifunutagomavosowewites.pdfIn PDF document text
- http://inbond-cn.com/userfiles/file/59712071636.pdfIn PDF document text
- http://www.motocams.cz/ckfinder/userfiles/files/rugukujekugunavezexipo.pdfIn PDF document text
- http://thumpamonpally.com/userfiles/file/tirazejifafikigugep.pdfIn PDF document text
- http://upoart.com/ckfinder/userfiles/files/bexalupulosofijiseli.pdfIn PDF document text
- http://seanmore.com/userData/board/file/75865435501.pdfIn PDF document text
- https://mayersoffice.com/userfiles/file/16098997794.pdfIn PDF document text
- http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/68375885231.pdfIn PDF document text
- https://eirai.org/editor/ckfinder/userfiles/files/62390976743.pdfIn PDF document text
- https://drticket.ir/basefile/drtiketcom/files/23618815229.pdfIn PDF document text
- http://gamax-moto.cz/data/dokumenty/xabetagesuron.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85ece564---telakijot.pdfIn PDF document text
- https://scavilecis.it/userfiles/file/kabojokolo.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_off0000e709.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE709	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF1B	17656 bytes
SHA-256: `8c1b5ff0cc949962c6dee43e9acc644a946fdb1d1ed9e417ebe849c1c15c51a3`
`font_02_sfnt_off00012d5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D5A	10400 bytes
SHA-256: `c391de59c3a0de233476639e0cc1646ff52b7e2e18a53a6981097276b356affd`

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