PDF malware analysis — malicious · cc8fd5d3cf17ee6c

MALICIOUS

PDF

91.5 KB Created: 2021-09-09 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a2426cd4ce6927866000b0c4beef4c5e SHA-1: 292535490368f5b7a3ec7797db29f07238fa08a4 SHA-256: cc8fd5d3cf17ee6c2613e869d794eb801ac1e85325570a360b9395525f2873d2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It 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. This suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=to+kill+a+mockingbird+activities+pdf PDF link annotation
- https://kingdomdatesuae.com/userfiles/files/47152014772.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076ddcb6b4---jokezobupoberoma.pdfIn PDF document text
- http://sunil.kr/uploadfile/fckeditor/file/fijokokazedanajefuv.pdfIn PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/11358725648.pdfIn PDF document text
- http://a2hgghk.handylover.com/upload/files/zofewexadeja.pdfIn PDF document text
- http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
- https://cheesykeju.com/contents/files/78284732680.pdfIn PDF document text
- http://maivietnamesecotati.com/uploads/files/90789740212.pdfIn PDF document text
- http://viviapalermo.com/userfiles/files/29314510745.pdfIn PDF document text
- http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/goredojibireru.pdfIn PDF document text
- https://conexkarvan.com/cache/fck_files/file/galovewufijog.pdfIn PDF document text
- https://dancleland.com/img/upload/file/73165128097.pdfIn PDF document text
- http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wepapigunufefi.pdfIn PDF document text
- https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/86437949874.pdfIn PDF document text
- http://yuhao-tech.com/userfiles/file/samofepaj.pdfIn PDF document text
- http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/12372985516.pdfIn PDF document text
- http://dungcumaymoc.com/Images_upload/files/mezumajuxesu.pdfIn PDF document text
- http://guoyangmoju.com/userfiles/files/zezopenetetupixodota.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/notanirukuzi.pdfIn PDF document text
- http://cambridgekapurthala.com/damana/userfiles/file/50993417442.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/56180162356.pdfIn PDF document text
- http://benhvienlaptop.biz/userfiles/file/ninolomupeto.pdfIn PDF document text
- https://dongcohonda.com/userfiles/file/91583152569.pdfIn PDF document text
- http://ansatrans.ru/admin/ckfinder/userfiles/files/fosagogewugejapaju.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_off0000fda9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDA9	18628 bytes
SHA-256: `18dd32cb06900b47f32b800c091fa94e801fd927d048eac2e1086ece4c9b806a`
`font_01_sfnt_off00012df7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001460e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1460E	11224 bytes
SHA-256: `7808f8c4b1135550fae78ef835bcaa53dcd5aea5505c3c717bb2ba2bb8d718b4`

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