PDF malware analysis — malicious · 891eadd22d02add7

MALICIOUS

PDF

75.4 KB Created: 2021-09-27 19:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: a6cc2f64f37fa726d86f5d9ddd45184e SHA-1: 77e5e6beafa154b84ca73ca8665748969ebbb5f5 SHA-256: 891eadd22d02add7e7397ffda0c8057d7243b8de686d6131b2aaa77dc8326904

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external URIs, including one identified as a link farm on disposable hosting, suggests the PDF is designed to redirect users to potentially harmful websites. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://chasehr.in/userfiles/file/zotidavisikefimese.pdf In PDF document text
- http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/vajowitixapuregutat.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc6a75055---8333292487.pdfIn PDF document text
- http://say-international.eu/userfiles/file/93372570399.pdfIn PDF document text
- https://mertlakustika.cz/images/pages/file/57824773239.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/75155234841.pdfIn PDF document text
- https://kingwrapcarspa.com/upload/files/51010135389.pdfIn PDF document text
- https://agri-mal.pl/userfiles/file/xotuvadejawepanapefizukin.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e5e57e---51362239548.pdfIn PDF document text
- http://trans-serwis.com/userfiles/file/62513320969.pdfIn PDF document text
- http://falconfam.com/ckfinder/userfiles/files/xodulerovidusi.pdfIn PDF document text
- http://sport-zavora.cz/data/file/gawinil.pdfIn PDF document text
- https://bank-kredit.at/ckfinder/userfiles/files/19197569737.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogabegoguloxemubavaz.pdfIn PDF document text
- https://reitinguok.lt/userfiles/file/87936544064.pdfIn PDF document text
- https://smartcrm.cloud/upload/files/87324371332.pdfIn PDF document text
- https://www.agencesramos.com/ckfinder/userfiles/files/49484092079.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/wewigabebujupovav.pdfIn PDF document text
- https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nibibafubasirorofunika.pdfIn PDF document text
- https://xn--49st2et51duvk.com/upload/files/25943973779.pdfIn PDF document text
- http://wingmanplanningdemo.com/userfiles/files/kowexironemozemabajod.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fastboot+and+adb+downloadPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b0b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0B8	10120 bytes
SHA-256: `2f7646b33b42ee8974919fb2f167907abf0f13012bbba821a3af992eb96e83ca`
`font_01_sfnt_off0000c77e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC77E	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`
`font_02_sfnt_off0000dd53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD53	16604 bytes
SHA-256: `090efd29edfbe1c159b062e0e23041a77fa3f4a07fc3cd1246a3760b7a2a28e1`
`font_03_sfnt_off00010736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10736	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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