PDF malware analysis — malicious · a118236a1d6b1107

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 23:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 64ecd5b5c1db10c1986beb273245f718 SHA-1: d00899c38d1d49dcfc31a3f8b04d90e608e3ac07 SHA-256: a118236a1d6b110728b9b9c16604a337dd6bcfc927d26698e43ba251370c0aa9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific rules like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. The primary function appears to be redirecting users to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=words+starting+with+z+ending+in+e PDF link annotation
- https://bestcoloringpages.com/userfiles/file/gadoropagizena.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27289882a---86050371795.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/sujemuzapoj.pdfIn PDF document text
- https://rasathantrananotech.com/ckfinder/userfiles/files/84018458576.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161427be40c71d---xinovogus.pdfIn PDF document text
- https://sindhuinvestment.com/ckfinder/userfiles/files/9904350460.pdfIn PDF document text
- http://saktigroup.in/uploads/vazidubagigisiduvuf.pdfIn PDF document text
- http://thietkewebsite.btccorp.vn/uploads/files/xipituxagagopulupevup.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8a2d6361---30621538630.pdfIn PDF document text
- http://st-johnson.com/Uploadfiles/files/folatur.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
- http://lexen.ca/userfiles/files/20196862501.pdfIn PDF document text
- http://agriturismoilnoceto.com/userfiles/files/21950450870.pdfIn PDF document text
- https://www.idd.no/ckfinder/userfiles/files/9161565886.pdfIn PDF document text
- https://chogmai.org/ckfinder/userfiles/files/32071392600.pdfIn PDF document text
- http://cu-mbc.com/ckfinder/userfiles/files/58706339014.pdfIn PDF document text
- http://hrudolf.com/userfiles/78292333901.pdfIn PDF document text
- http://elazentrale.de/images/uploaded/file/gaxopunebaz.pdfIn PDF document text
- https://dragonexpressml.com/userfiles/files/poxalofuboguruwajativad.pdfIn PDF document text
- http://koyomisushi.com/uploads/files/8951213964.pdfIn PDF document text
- https://sailstudy.in/ckfinder/userfiles/files/fitimisuf.pdfIn PDF document text
- http://storemisr.com/uploads/files/pofolakogazojatopotani.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_off0000cb08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB08	10620 bytes
SHA-256: `69a3913b5a6abd503bb3877e5af78498f9dfc1fbe087a5f61262390c6876cdbe`
`font_01_sfnt_off0000e326.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE326	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fb38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB38	17720 bytes
SHA-256: `e85177cd380a18d35170b40aaabf251f00a631668d9bb03cc5bcbf0a87a070ba`

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