PDF malware analysis — malicious · 822f2bbab87ab4a7

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 02:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d339d126c2b748b1777c29e9468ee29a SHA-1: 2832cb5e2e9564bf31bf3b6ba007ebc10fb66baa SHA-256: 822f2bbab87ab4a75ba8e452a733a21f726ba5308d6b48567f4fb5b1aaa5324d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=how+to+keep+app+running+in+background+android PDF link annotation
- http://smolensk-bakaleya.ru/userfiles/file/timozeluzivigukiwo.pdfIn PDF document text
- https://salvatoredivilio.it/userfiles/file/25883741125.pdfIn PDF document text
- http://1carl.com/userfiles/file/ligudujobizuseboforu.pdfIn PDF document text
- http://96rangjai.com/userfiles/file/wenafivukisanikeduruno.pdfIn PDF document text
- http://bbbo.handyfriendship.com/upload/files/dowupa.pdfIn PDF document text
- http://uticachemical.com/files/upload/files/63322359861.pdfIn PDF document text
- https://dondepodemosir.com/userfiles/file/91747716394.pdfIn PDF document text
- http://reutlinger.pl/userfiles/file/72037078238.pdfIn PDF document text
- https://aspirecambodia-edu.org/userfiles/file/20883241404.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/45589935526.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ctnmpuk6hq94voe3aq6uiio3q5/99573625918.pdfIn PDF document text
- http://szjglaw.com/uploadfile/file/2021091105094373499.pdfIn PDF document text
- http://www.pacautomarketing.com/file/fejukufopadubokobu.pdfIn PDF document text
- https://nezamirekhaseafoods.com/userfiles/file/53310859525.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/24148923374.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/89182034618.pdfIn PDF document text
- https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/52521987278.pdfIn PDF document text
- http://sirindhorn.net/upload/File/petifiro.pdfIn PDF document text
- http://windowsplusllc.com/ckfinder/userfiles/files/dokusikobotisirate.pdfIn PDF document text
- http://praconsulgroup.ru/pict/file/89113115168.pdfIn PDF document text
- http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/negirojotutiruka.pdfIn PDF document text
- http://oecschool.com/userfiles/file/maxosikinozez.pdfIn PDF document text
- https://damiel.eu/userfiles/file/88764318460.pdfIn PDF document text
- https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/34859820475.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_off0000d68a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD68A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eea1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA1	10884 bytes
SHA-256: `212d18f825c9dc8a690fcf5d2ef6498f8dbf3f4cdd5c19ed7105bf3dba3012a2`
`font_02_sfnt_off0001077e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1077E	17728 bytes
SHA-256: `51b598832535b76086927613fb8379923ccd2e10cd8d16bc2abbe461aaacd845`

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