PDF malware analysis — malicious · d716da3d44b55786

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 36d6c7ab48679e68d43df1d500c57ef2 SHA-1: c4ac4fc8a34706cfe595b38b008d0575492aafd9 SHA-256: d716da3d44b55786c666506dd154e3b7e13290625d13ffaf608db709ddb09c32

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URIs. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code or redirect the user. The external URI points to a site offering a 'truecaller premium app free download', a common lure for phishing or malware distribution, aligning with a Spearphishing Attachment (T1566.001) attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=truecaller+premium+app+free+download PDF link annotation
- http://www.rannatennis.ee/data/upfiles/files/xuvukodanojidudo.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/23865710168.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/65296204931.pdfIn PDF document text
- http://gloteckr.com/upload/editor/file/fuxaboranogalovo.pdfIn PDF document text
- https://rais.bg/uploads/file/5311722551.pdfIn PDF document text
- https://epponline.com/mentorfinancial/page_images/file/pajulej.pdfIn PDF document text
- https://coaching-jk-academic.com/ckfinder/userfiles/files/xabidanaxovafotaruzutubal.pdfIn PDF document text
- http://siamintertrade.com/file_media/file_image/file/xoxebixopapizogan.pdfIn PDF document text
- https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/20007828788.pdfIn PDF document text
- http://pure-chiral.com/upload/files/16833473155.pdfIn PDF document text
- http://humanlitech.com/files/files/79696591597.pdfIn PDF document text
- http://garmaclima.com/uploads/ckfinder/files/38432435922.pdfIn PDF document text
- https://ijp2.com/contents/files/vimofodetula.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/muwemedikokazezaloxupe.pdfIn PDF document text
- http://hmondo.com/userData/board/file/kobumaromu.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161326f4b769be---43914032358.pdfIn PDF document text
- http://conhantaoankhanh.com/webroot/img/files/malotazapixevibopenomud.pdfIn PDF document text
- https://www.rougeindigo.com/ckfinder/userfiles/files/9048905438.pdfIn PDF document text
- http://toyotaprius-custom.com/js/upload/files/53152741139.pdfIn PDF document text
- http://dnepropress.net/files/file/31502198733.pdfIn PDF document text
- http://scamps.biz/userfiles/file/molerexodexatatubalaja.pdfIn PDF document text
- http://tufaghanafc.com/js/ckfinder/userfiles/files/66637252449.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mfe5potjjv683d335iasrhv9p2/putewobipediw.pdfIn PDF document text
- http://ordineveterinarireggioemilia.it/userfiles/files/dosomoxajozujebedibo.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_off0000e0bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8CD	17536 bytes
SHA-256: `56a655e38aab0f9f4fc95e96475fbd9b5153f285f682ce5457b9869ffdf1dd9d`
`font_02_sfnt_off00012608.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12608	10664 bytes
SHA-256: `65df3038c8dc30cf9e30ff4e015670560baff8b400bd5d41674d0d3588852730`

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