PDF malware analysis — malicious · bb9cecf8d4c4c2ce

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: aa190881ffb126c2cc16bd9f1a9f533d SHA-1: 8f5f2c56243082ff3e1b08e7ec821588aac8f422 SHA-256: bb9cecf8d4c4c2cea1a061069ed16600bafdb7b400f9f578df0e318ef63f59a6

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting, coupled with the 'Password-protected archive handoff' heuristic, suggests a phishing lure designed to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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
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.
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=how+to+change+locked+pdf+document PDF link annotation
- http://marketingnews.fr/images/file/firaluxumeruravifak.pdfIn PDF document text
- https://timminsrenovations.ca/file/ZD8Me2FOc62mTxl3.pdfIn PDF document text
- http://njchemland.com/upload/files/74199728301.pdfIn PDF document text
- http://kayapalinakliyat.net/file/39711154972.pdfIn PDF document text
- http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/57759723982.pdfIn PDF document text
- https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/21265816152.pdfIn PDF document text
- http://bc-arman.kz/ckfinder/userfiles/files/xewamepenasew.pdfIn PDF document text
- http://hsi-international.com/ckfinder/userfiles/files/95073776961.pdfIn PDF document text
- http://meubelenindex.nl/images/uploads/riletib.pdfIn PDF document text
- http://almawred-sy.com/files/adminfiles/files/xijewoj.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137ceb3dceb9---fupukelagutozodate.pdfIn PDF document text
- https://editionsitaliques.com/userfiles/file/megubarusatife.pdfIn PDF document text
- https://educhina.mn/editor/files/guxez.pdfIn PDF document text
- https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
- http://parbatsamajjapan.com/img/files/files/wiginemosed.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/12199455034.pdfIn PDF document text
- https://medarbindia.org/ckfinder/userfiles/files/kevamaga.pdfIn PDF document text
- https://indiansabroad.uk/userfiles/file/82646493156.pdfIn PDF document text
- http://f-okinawa.com/img/tmp/file/68892060864.pdfIn PDF document text
- https://apotekatia.ba/fajlovi/32496692506.pdfIn PDF document text
- http://izeninfo.net/admin/upload/files/kofumugu.pdfIn PDF document text
- https://cvsc.co/userfiles/file/26678399697.pdfIn PDF document text
- https://szalkasszorutacskok.hu/app/webroot/files/content/files/53225836987.pdfIn PDF document text
- http://logicamail.it/draft/media/vezolowapuxos.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_off0000d34b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD34B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB5D	17948 bytes
SHA-256: `f5d73cc78b9da08bd4c28b09ae650338f8c33235a3abd3b2301b0ab33d32a3b2`
`font_02_sfnt_off000119ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119AE	10976 bytes
SHA-256: `0ea1cb724ce0d2351dc591fb94c09ade7305fd484afb4bf384e66a23f776634f`

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