PDF malware analysis — malicious · b43c6851edcb7abf

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 09:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 03b83f69028fcc6760a1b77c7711a76b SHA-1: f2082fa3782295a226d20b0572d4fc637fb93d12 SHA-256: b43c6851edcb7abfae60fd1954c1a341a1bc40588a70bc6e04d91090c6137dd3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm hosted on disposable domains, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or facilitate phishing through the embedded URI.

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
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://coretry.ru/uplcv?utm_term=football+games+mod+apk+download PDF link annotation
- https://www.eos.org.eg/ckfinder/userfiles/files/vadilotiwegikezoxada.pdfIn PDF document text
- https://essuances.com/ckfinder/userfiles/files/37028796002.pdfIn PDF document text
- http://anapro.com/ckfinder/userfiles/files/gawexolateb.pdfIn PDF document text
- http://www.celso.org/download/kasuvaminodevivaker.pdfIn PDF document text
- https://acconpriti.com/ckfinder/userfiles/files/45515015096.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336491009cb---26080003745.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/37021683865.pdfIn PDF document text
- http://asr-net.ru/uploads/files/56907980625.pdfIn PDF document text
- http://justsayhi365.com/uploads/file/33482975262.pdfIn PDF document text
- https://juhaszautovill.hu/userfiles/file/tagabopetugoluwe.pdfIn PDF document text
- https://picinterior.com/ckfinder/userfiles/files/tesibaporetapo.pdfIn PDF document text
- https://ntiverification.com/userfiles/file/69547080449.pdfIn PDF document text
- http://gidaero.com/upload/fckeditor/file/pavozozininonajoteweduje.pdfIn PDF document text
- http://erex.hu/upload/file/ruvonufifetiwurovawidun.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210910110520118.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/mimijewi.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/9105320809.pdfIn PDF document text
- https://arch.ua/ckfinder/userfiles/files/61006692347.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10eaf80a1bf99fc70c061890ed591fc/17491856873.pdfIn PDF document text
- http://computerdoki.hu/user/file/zisezixolurut.pdfIn PDF document text
- http://titibbs.xyz/js/ckfinder/userfiles/files/ravesazam.pdfIn PDF document text
- https://coffotea.com/uploads/files/202109031030546366.pdfIn PDF document text
- https://paeonia.ch/userfiles/files/tusafisegomizo.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/36998225880.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_off0000d1c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1C4	16520 bytes
SHA-256: `581dea05f93eae164e0e143ca44ef29f691911126aa856348e5f48f7453da29b`
`font_01_sfnt_off0000fc32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011449.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11449	10836 bytes
SHA-256: `b9fcee4976440af5911e717a1ae2b2254e4cb2ebdc2b3ec23805f82930da4231`

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