PDF malware analysis — malicious · c40c697e13a4d66f

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 13:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b756bb040ea891716fef85d2378a0866 SHA-1: 10d1e16cb27af802f2a52bfac53e2eef4450220d SHA-256: c40c697e13a4d66f6143c5cc1c563ee40959bc276d97578e6ea74d324800cd50

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDF files on different domains, indicating it functions as a link farm. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://coretry.ru/uplcv?utm_term=how+to+write+a+good+thesis+statement PDF link annotation
- https://www.profiemg.cz/upload/ck/files/bepigesoxalibivesazusirem.pdfIn PDF document text
- http://mgocsm.in/userfiles/file/89572262746.pdfIn PDF document text
- http://ohmamakitchen.com/uploads/files/kadevuwububazeran.pdfIn PDF document text
- http://wujipacking.tw/upload/files/23868587932.pdfIn PDF document text
- http://tlumacz-bialystok.pl/pliki/file/jomagifezemuz.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///lozim.pdfIn PDF document text
- http://96rangjai.com/userfiles/file/44519476837.pdfIn PDF document text
- http://e-sportis.com/images/upload/kesujuturudasifilo.pdfIn PDF document text
- http://bebaldebaran.eu/userfiles/files/85186111012.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles/file/37278941104.pdfIn PDF document text
- http://abbeytraining.net/userfiles/file/jasabexegoxuvasega.pdfIn PDF document text
- https://stealthwindow.tw/uploads/files/202109070809057288.pdfIn PDF document text
- http://campfirewtx.org/userfiles/file/18347331619.pdfIn PDF document text
- https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdfIn PDF document text
- http://megatex-plast.ru/pub/file/valoraj.pdfIn PDF document text
- http://xyr59.com/filespath/files/20210902143701.pdfIn PDF document text
- http://mdfgiare.com/upload/files/62781153917.pdfIn PDF document text
- http://powerfalcon.net/uppic/files/fukirakodod.pdfIn PDF document text
- https://coil.hk/upload/files/7874724847.pdfIn PDF document text
- https://atavio.ru/files/file/lanupejapinavogobitupupef.pdfIn PDF document text
- http://www.celso.org/download/jofijugupifopenexisero.pdfIn PDF document text
- https://www.ebenisterie-burette.com/ckfinder/userfiles/files/pixonulilurixuxonakapip.pdfIn PDF document text
- https://ambulatorioveterinariosismondi.eu/file/revovapipuwomeru.pdfIn PDF document text
- https://przyklejki.pl/userfiles/71614156959.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.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_off0000ed73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED73	17276 bytes
SHA-256: `e77c09f80606500538bf0061b881f5b6dec6022782eb69db92f1d228d1772501`
`font_01_sfnt_off00011a25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A25	10728 bytes
SHA-256: `a25c2e50a43849436923f504ba7ad5c97c1dbeb2e3be1fb815941f7d6d4c75c9`
`font_02_sfnt_off0001326a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1326A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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