PDF malware analysis — malicious · cb5c228c38f1f4ad

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 20:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9fea833e8579d5e49db175d87f68e27b SHA-1: 6e95e82831017f97c0b4ed57a68868862c10b607 SHA-256: cb5c228c38f1f4adb727794dcbc21211ec0978cc47285d72296beb2ffcf8052e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also acts as a link farm, directing users to numerous external URLs hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=import+android+view+menu PDF link annotation
- http://2rent.gr/userfiles/file/sogesedurapiwexuluru.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5d6db8fa7f47c38b0c199b2fa628e35/limowiborumazir.pdfIn PDF document text
- http://mijn-nederland.nl/userfiles/file/84472598139.pdfIn PDF document text
- http://budaikepkeret.hu/uploads/file/25203104363.pdfIn PDF document text
- https://techielingo.com/fck_uploads/files/12295447098.pdfIn PDF document text
- http://www.cemeba.com/uploads/ckfinder/files/8606568891.pdfIn PDF document text
- http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/devotumepizofaposufije.pdfIn PDF document text
- http://epoch-making.jp/js/upload/files/36772402016.pdfIn PDF document text
- http://www.letnifestiwal.pl/ckfinder/userfiles/files/95123112261.pdfIn PDF document text
- http://apsara.ru/userfiles/file/domug.pdfIn PDF document text
- http://hyeminshop.com/DATA/files/kuduxuvuf.pdfIn PDF document text
- http://mywayrtk.info/userfiles/file/14136489370.pdfIn PDF document text
- http://trevelsi.ru/ckfinder/userfiles/files/60171654288.pdfIn PDF document text
- http://chayka-svg.ru/files/424195078.pdfIn PDF document text
- http://teakdeck.pl/files/file/rapaluja.pdfIn PDF document text
- http://status.cz/UserFiles/File/15231346688.pdfIn PDF document text
- http://lafenicealcamo.it/userfiles/files/kisubufajakokufu.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/73fd572791fa67b0476f389173a7f317/84863390630.pdfIn PDF document text
- https://indiantiffin4me.com/nbloom/fckuploads/file/21159034765.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/malenorijixepidiresero.pdfIn PDF document text
- http://zulaikhatextile.com/userfiles/files/68689721631.pdfIn PDF document text
- http://wccflooring.com/userfiles/files/wivataxumamuriwi.pdfIn PDF document text
- http://fkm-lux.by/var/upload/file/12548785040.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/gezemanapakujuvapafodaw.pdfIn PDF document text
- http://strahyi.ru/images/file/futitanujerogo.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_off0000c402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC402	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC14	17788 bytes
SHA-256: `0d9441ca8d12a465fcfe914ff9714f588a370fa55cb4c0232a50e0ab9c784765`
`font_02_sfnt_off00010962.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10962	10544 bytes
SHA-256: `c0b7ebab2ea8f31d706e0eb313717188f25222f2a3c61fbec23028c582079bdb`

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