PDF malware analysis — malicious · 8ca36f10fd6b0332

MALICIOUS

PDF

79.5 KB Created: 2021-09-24 03:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 412ea1a9ffd8dee49731fcefe3671f7e SHA-1: 6ed6c6d299d0b2f9e8c8e79561b9141e814141fa SHA-256: 8ca36f10fd6b03329709437ffa0fc262f6ea74a129a6e13ef6b582410ed75e49

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple external URIs were extracted, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=apk+award+minecraft+beta PDF link annotation
- http://gunjanjain.com/app/webroot/js/uploads/files/ranapifewupuxujezekidab.pdfIn PDF document text
- http://zekejozsef.eu/FCKfeltoltott/file/sovaramarixojuda.pdfIn PDF document text
- http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/68665075803.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hu7rnfou2ejpsj844i6tl3p31/guruz.pdfIn PDF document text
- https://digireg.org/upload/58417929337.pdfIn PDF document text
- https://safetypadlocks.eu/eurostyl/photos/file/67155761775.pdfIn PDF document text
- https://laptoptranganh.com/data/dulieu/files/14246695289.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28628387a4f07ce1733e80f844425b93/latoroketaruwilubaz.pdfIn PDF document text
- http://appextskihjthj.handysociality.com/upload/files/garakanukajodekusorevunu.pdfIn PDF document text
- http://denprokhorov.ru/images/file/mowemedenerofusana.pdfIn PDF document text
- https://hawkseyetravels.com/assets/ckfinder/userfiles/files/tuwosokozuwoboser.pdfIn PDF document text
- http://df-2.de/images/daten/file/95497807391.pdfIn PDF document text
- https://ijmscr.com/ckfinder/userfiles/files/wofewejowuvazaledi.pdfIn PDF document text
- https://houstoncoinclub.org/FCKeditor/file/69056127989.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/pejopiluliwukegasu.pdfIn PDF document text
- https://protectname.xyz/whoisprivacy/userfiles/files/liwofijigimelafibegujomo.pdfIn PDF document text
- http://peoplefineart.com/assets/202109/files/20210914122740961485.pdfIn PDF document text
- http://obkladacstvikolar.com/content/19914060785.pdfIn PDF document text
- https://jetaime-shop.dvsportbg.com/files/zavulilij.pdfIn PDF document text
- http://dogalakustik.com/depo/sayfaresim/file/68230013786.pdfIn PDF document text
- https://ijtm.in/userfiles/file/76722893943.pdfIn PDF document text
- https://artgallery.devctn.com/ckfinder/userfiles/files/nagojofapuginurul.pdfIn PDF document text
- https://vongtaytramhuong.vn/upload/files/jefubumaxalokevedirekeji.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_off0000d3c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3C0	10744 bytes
SHA-256: `784a062eee711cbfe72b0dc41335bc605f7a976e29603bbc15c26f332b3730ef`
`font_01_sfnt_off0000ec4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001045f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1045F	16560 bytes
SHA-256: `6ba14af404eaa4d017137be95c0e978b1c8506e1b6f21444c6a7290a18e01ea0`

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