PDF malware analysis — malicious · ec42672353a85b38

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 16:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ea236501539d2db282367fc2ebc3ba97 SHA-1: 1ef55d5907626c9dd4c48662e53af2039a229627 SHA-256: ec42672353a85b386969274b3089082cd59073140746c66254c6f3918535ec2a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://chcial.ru/uplcv?utm_term=how+to+transfer+contacts+from+one+cell+phone+to+another PDF link annotation
- http://havefuntogether.com/image/upload/File/20356682195.pdfIn PDF document text
- http://xn--tnqz8hz5cb8l.com/upload/files/koranareweka.pdfIn PDF document text
- http://zdravi-kromeriz.cz/files/file/bajabategad.pdfIn PDF document text
- https://matricula.netlandschool.cl/files/81208207231.pdfIn PDF document text
- https://ferropula.hr/files/36120097494.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/tixomitufuxa.pdfIn PDF document text
- https://aashianarealty.com/file/61592110263.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/lefipotemu.pdfIn PDF document text
- https://aslplastic.com/ckfinder/userfiles/files/42146374320.pdfIn PDF document text
- https://eagle-aviation.com/userfiles/files/papizomavomavig.pdfIn PDF document text
- https://sapsda.com/SapmaUserfiles/file/luzujuvarogibijem.pdfIn PDF document text
- http://imailbox.nl/images/uploadedimages/file/papaloxilaxi.pdfIn PDF document text
- http://chemicalengineers.ie/images/venirikizufevupedi.pdfIn PDF document text
- https://dadesigning.com/daduserfiles/files/webonijijabizikutapirib.pdfIn PDF document text
- http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/xakinikum.pdfIn PDF document text
- https://torbay.ru/images/uploads/file/62988260839.pdfIn PDF document text
- https://takarasushimn.com/userfiles/files/lozubinireti.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/tipadik.pdfIn PDF document text
- https://tradegateindia.com/userfiles/file/20486164334.pdfIn PDF document text
- http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/17732876182.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa7c5459e---zanulewosalipetebufuzir.pdfIn PDF document text
- http://ride-on-earth.com/images/blog/file/bosizexadonuriporixudu.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/60471072631.pdfIn PDF document text
- http://jts-electrical.co.uk/ckfinder/userfiles/files/24975813519.pdfIn PDF document text
- http://devison-matras.ru/upload/file/zifaditurubulupinotifejod.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_off0000ec13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC13	10728 bytes
SHA-256: `e17a3f6752b9f5731a2903147d66ff787082f7a8bdd2914178fbea2d4c2743b2`
`font_01_sfnt_off00010495.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10495	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ca7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CA7	17536 bytes
SHA-256: `150618987bf06843a4d2afb5328ba86ff8df43c16c71624e8713b993920aca73`

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