PDF malware analysis — malicious · 8743716275bd169d

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bcbeb1522927e2d977e1a060a75afa2b SHA-1: 4248a93e440b0bc0956b6661214955780bc41102 SHA-256: 8743716275bd169d93a4d7f08e7de50314b10ce47ef1754705ed54a3e9fdc68d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically pointing to a download URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of JavaScript suggests an attempt to execute code or redirect the user.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=notifybuddy+app+download PDF link annotation
- http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/wubipobiduxukewejugolusin.pdfIn PDF document text
- http://breakevenpoint.pl/uploads/editor/file/latomovobelegofabira.pdfIn PDF document text
- http://studio-rivetti.it/userfiles/files/15407316631.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a826a86b88---mosak.pdfIn PDF document text
- http://thaicockstar.com/ckfinder/userfiles/files/rizivuweredegeruv.pdfIn PDF document text
- https://penmypoem.com/new/admin/uploadfiles/file/71001644770.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210916124415.pdfIn PDF document text
- https://skyzoan.com/cake/beta/userfiles/file/33174035247.pdfIn PDF document text
- http://hotelpenza58.ru/ckfinder/userfiles/files/82734294581.pdfIn PDF document text
- http://kingkady.cn/uploadfile/files/bakagapisujix.pdfIn PDF document text
- https://inprovitpuertorico.com/ckfinder/userfiles/files/wexifo.pdfIn PDF document text
- https://tekdalyapi.com/upload/ckfinder/files/dowumefes.pdfIn PDF document text
- http://allefrgycg.news-read.com/upload/files/xopotunotudovajogo.pdfIn PDF document text
- http://donkaew-furniture.com/ckfinder/userfiles/files/sopevewenemibozazeka.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bd19d54b---motaradudajofexuno.pdfIn PDF document text
- https://jetaime-shop.com/files/vapedejijavanumewiwex.pdfIn PDF document text
- http://ztkammer.at/uploads/file/47521708172.pdfIn PDF document text
- http://nfc-lampang.com/user_img/files/julufakarubofat.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/72851300229.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb60b1bc---zukadiwonufejevimug.pdfIn PDF document text
- https://thietbivesinhsonhoa.com/webroot/img/files/gatisenab.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/lurobizugepeg.pdfIn PDF document text
- http://clubselectionvoyages.com/images/file/51106309339.pdfIn PDF document text
- https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000de7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE7C	18052 bytes
SHA-256: `10e2140366ac0042d2eb68953129b42484a569532b925c6e6dc79ea3746dcdcb`
`font_01_sfnt_off00010cbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CBC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000124d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124D3	10508 bytes
SHA-256: `a5be17144fa1fdd8d4bf32a4cd2fd1701eab02cddf85f1e90f898c59372bb28b`

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