PDF malware analysis — malicious · b4c5ac807c3e1165

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 17:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 765a291f9081a891c1c9c2e9587fc157 SHA-1: 43f8685398101497a12feb583e5e6a9c64fa19f4 SHA-256: b4c5ac807c3e1165152341e5fea04df178b4b801964e17ba378ba41e3a04ed40

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=supernatural+season+1+putlocker PDF link annotation
- https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wojuwovalajis.pdfIn PDF document text
- http://crmrealty360degree.in/ci/userfiles/files/sezupavikegi.pdfIn PDF document text
- http://355353.ru/userfiles/file/32583442347.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/movonozagonitisodet.pdfIn PDF document text
- http://gesundheit-im-blog.de/userfiles/file/68467620842.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/kekomun.pdfIn PDF document text
- https://mauspro.net/upload/files/belopedanutimoniboj.pdfIn PDF document text
- http://bestofbeer.ru/ckfinder/userfiles/files/51625305667.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5b9ab168---45345072166.pdfIn PDF document text
- http://www.siphonicflowmandiri.com/upload/files/zisidabubibis.pdfIn PDF document text
- http://ksnjl.com/userfiles/files/88779307792.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/wokam.pdfIn PDF document text
- http://cobe-ing.it/userfiles/files/zodijuzak.pdfIn PDF document text
- https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/32215638176.pdfIn PDF document text
- http://dongduong.net/Images_upload/files/69942722366.pdfIn PDF document text
- http://sasmedm.com/www/js/ckfinder/userfiles/files/44278524721.pdfIn PDF document text
- https://skvely-kup.cz/files/file/31289882062.pdfIn PDF document text
- http://xn--franzsischebulldoggen-lec.eu/userfiles/file/14215434292.pdfIn PDF document text
- http://iphysiology.ru/upload/lotetatigif.pdfIn PDF document text
- https://bfull.ru/uploads/files/29860783875.pdfIn PDF document text
- http://mudrberanova.cz/userfiles/file/jalubiweruzejik.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/86601562548.pdfIn PDF document text
- http://kssi.ir/public/userfiles/file/28571748296.pdfIn PDF document text
- http://prompol.com/media/file/dilitiwop.pdfIn PDF document text
- http://beta-rc.com/upload/files/mopigamawotozogaxamibire.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d2ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2AC	10596 bytes
SHA-256: `99372087ea074e86e3a1fd3ba1b28f3953b817d76e938ebfd3cc1ed24024d34f`
`font_01_sfnt_off0000eb09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB09	16448 bytes
SHA-256: `0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878`
`font_02_sfnt_off000101de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101DE	17616 bytes
SHA-256: `83721b526a7f526289cbcbfbf7800b0d32988002e6ee2b866ec0c6179f6730d6`
`font_03_sfnt_off00012ec4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EC4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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