PDF malware analysis — malicious · be21be03a0ecbe69

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 22:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: ff36122266f090e055b7ec23f4a72cf8 SHA-1: f0b266d2e50579dcbad4482926335bc73e5afdc0 SHA-256: be21be03a0ecbe69a7544c8d019be27a5208367abb3aaa65d9748b1398b381a2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, many of which appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download or redirection to a secondary malicious resource.

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://crysiq.ru/uplcv?utm_term=3+main+nerves+in+arm PDF link annotation
- http://pujcovnanaradi-tvarozna.cz/userfiles/files/nejipevajuruwewejukanize.pdfIn PDF document text
- http://rickgrisolia.com/userfiles/files/totupalu.pdfIn PDF document text
- http://studio-rivetti.it/userfiles/files/wizuvarugawume.pdfIn PDF document text
- https://ms01bet.com/contents/files/14670380895.pdfIn PDF document text
- http://kpdb.org/userfiles/files/9499593989.pdfIn PDF document text
- https://gionggiacam.com/ckfinder/userfiles/files/61150839589.pdfIn PDF document text
- http://sport-zavora.cz/data/file/77885362607.pdfIn PDF document text
- http://istanbulballoons.com/ckfinder/userfiles/files/tigujamirub.pdfIn PDF document text
- https://christianklein.eu/Quansis/ckfinder/userfiles/files/nuzotopava.pdfIn PDF document text
- http://jsushibrea.com/uploads/files/11163577522.pdfIn PDF document text
- https://chinese-wall.tw/upload/files/37811407147.pdfIn PDF document text
- https://tommytest.dish1314.com/data/html_editor/files/56273588362.pdfIn PDF document text
- https://sandipkumardutta.com/ckfinder/userfiles/files/lobawekifekamiso.pdfIn PDF document text
- https://ijp2.com/contents/files/21294527968.pdfIn PDF document text
- http://take114.kr/FileData/ckfinder/files/20210905_F6450512998C063A.pdfIn PDF document text
- https://tigaintan.com/contents/files/98632464265.pdfIn PDF document text
- http://bixenony.com/userfiles/files/burinupipuxekuxaje.pdfIn PDF document text
- https://pavillonwohlen.ch/userfiles/files/negumusudovofilumaso.pdfIn PDF document text
- http://fatamorgana.fr/uploads/assets/file/figogiguvomisimudetukos.pdfIn PDF document text
- https://areopag.ru/sites/default/files/uploads/nogopojegede.pdfIn PDF document text
- https://pgprojekt.pl/Upload/file/22148294614.pdfIn PDF document text
- http://teen.plovdivweek.com/js/ckfinder/userfiles/files/91387416701.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0c49f2d6---21468957706.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3so6bdeeeu0veehsfs4jbsdm23/84843860480.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_off0000dcb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCB4	17276 bytes
SHA-256: `0a5cea1805388f90a6549aff6b2d658c10efd0aa1f54d28d64d146dcd50d871e`
`font_01_sfnt_off00010986.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10986	10144 bytes
SHA-256: `1ad366d064e6944599fc676dcae03a53e36bd39574adc8e79c551bfcea0e131a`
`font_02_sfnt_off00012020.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12020	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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