PDF malware analysis — malicious · d9eb599b3bb15141

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 03:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 3b851c1fe5086db6b325210245c63074 SHA-1: 64cd4c1448f84679380b28fb16b8d28a562bcd22 SHA-256: d9eb599b3bb151413b3e8b7914c8e0fda8deeb5c1130f0963931d4729aa39dcd

134 Risk Score

Malware Insights

MITRE ATT&CK

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 numerous external URLs, many of which point to PDF files hosted on potentially disposable domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n1d38c19nc2ececvnhbktm6bao/67750501853.pdf In PDF document text
- https://cbdc.co/uploads/ckfinder/userfiles/files/guwosifunoxolunesufovigov.pdfIn PDF document text
- http://modernplating.com/userfiles/file/sezixutezulozoveseru.pdfIn PDF document text
- https://genia-groupe.fr/images/files/taxapudipegunuwapifa.pdfIn PDF document text
- https://majubesar.info/contents/files/wuregovokuzamoz.pdfIn PDF document text
- http://www.bandungmesin.com/file/wekigezubetowofik.pdfIn PDF document text
- http://se-ty.com/uploads/userfiles/file/452296926.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139296acf049---78595353384.pdfIn PDF document text
- https://toocapen.com/files/beliw.pdfIn PDF document text
- http://tochuchoinghi.org/files/runofatipuk.pdfIn PDF document text
- https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/lolonekifuxoli.pdfIn PDF document text
- http://chieucoingason.vn/files/39322695603.pdfIn PDF document text
- https://krygina40.ru/UserFiles/File/95873067872.pdfIn PDF document text
- http://associatedreclaimed.com/userfiles/files/mumaxidijoz.pdfIn PDF document text
- https://asztromiskolc.hu/ckfinder/userfiles/files/25988140707.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/xugagukixisu.pdfIn PDF document text
- http://kpdb.org/userfiles/files/pejaxesalariwe.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/raritukozaxat.pdfIn PDF document text
- https://sealand-pptc.com/userfiles/file/tezoferusoworaxofuvowame.pdfIn PDF document text
- http://misterholidaysanprisco.it/userfiles/files/16016740710.pdfIn PDF document text
- http://olgapolyakova.com/files/files/tidif.pdfIn PDF document text
- http://optometrystaprzemysl.pl/userfiles/file/mekebuwaja.pdfIn PDF document text
- http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/49875977509.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+system+launcher+for+androidPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6BA	17500 bytes
SHA-256: `32b8f6459f60438f726514a81f033c1481b95e9e416e38d9f8d52736d8c3f29d`
`font_02_sfnt_off00012436.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12436	11008 bytes
SHA-256: `7546161bba0d634442f359e83120197cfe2de5ac4dd8599eede87a31af7b0986`

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