PDF malware analysis — malicious · f4d39fef76f239e8

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: aaf0fda9887df28eb5f7cf527c1e3836 SHA-1: 000c40afcfd2840bbc47d79cbf0e93d7d0e75170 SHA-256: f4d39fef76f239e882e3403e608e90ea6a033fead6c67bf30405868007f03970

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. It contains embedded JavaScript, which is commonly used to redirect users to external sites for phishing or to download further malicious payloads. The presence of numerous external URIs, many pointing to disposable domains, further supports the phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=triangle+cloud+gaming+apk PDF link annotation
- http://budoprojekt.eu/obrazy/file/lixaziwadowu.pdfIn PDF document text
- http://pandoraecza.com/genelresimler/file/nekubako.pdfIn PDF document text
- https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/86485002892.pdfIn PDF document text
- https://artedeeducar.com.br/ckfinder/userfiles/files/60075040312.pdfIn PDF document text
- http://patp1ryb.ru/media/file/bomepaxomeka.pdfIn PDF document text
- https://danielfelber.ch/userfiles/file/51880697916.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d545b33148---zotojix.pdfIn PDF document text
- http://kiuanai.com/userfiles/file/kegabozazadezew.pdfIn PDF document text
- http://delve-cr.com/uploads/dazew.pdfIn PDF document text
- https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/39591707237.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/rajonifiz.pdfIn PDF document text
- http://abwcockeysville.com/uploads/files/numavapipetugibugotez.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/87183940875.pdfIn PDF document text
- https://wheelmartthailand.com/image/upload/File/28070282838.pdfIn PDF document text
- https://eetravel.net/file/jowivefakiko.pdfIn PDF document text
- http://captainkillmite.com/uploads/files/202109111946267255.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/doridumo.pdfIn PDF document text
- http://ilyxrace.com/userfiles/files/bulapuxejomekepapobexelej.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/84054174340.pdfIn PDF document text
- http://santamariamikado.com/uploads/files/60941657414.pdfIn PDF document text
- http://studiosaletta.it/userfiles/files/77045522266.pdfIn PDF document text
- http://babijie.com/upload_fck/file/2021-9-2/20210902182829101896.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d8a7cb74---kudaxufipisutosobotomak.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/64073764977.pdfIn PDF document text
- https://speculatio.in/ci/userfiles/files/78479752393.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_off0000cd6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD6D	18288 bytes
SHA-256: `740917204de41c236aa790b8465b94595409bcec88838b17f82c502dbbf0087e`
`font_01_sfnt_off0000fcf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF9	10744 bytes
SHA-256: `a575bad8f465172eca0bc2efd0d7ae98240ee2296f60386d77014041e5d0b950`
`font_02_sfnt_off0001155b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1155B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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