PDF malware analysis — malicious · f638a330a75bf1ef

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 12:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2e0b4713ff444d3b489e25c2dead5118 SHA-1: 88d75e1f455e6e3260b014fad341e99c85d053e5 SHA-256: f638a330a75bf1ef920f10be47c0d90a84cd7d6f78493cb803a9c0179c77dc1c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external links indicates an intent to redirect the user to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 5

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.
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://huntic.ru/uplcv?utm_term=american+accent+training+grammar+pdf PDF link annotation
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c793d2b6---xurozusinenutax.pdfIn PDF document text
- http://sportservistocik.cz/UserFiles/File/zurenenogutavulud.pdfIn PDF document text
- http://weldingplaza.com/files/file/28705440326.pdfIn PDF document text
- http://xingzhongjing.com/userfiles/file/20210902131329_1122921028.pdfIn PDF document text
- https://borgopitti.it/userfiles/file/33007597834.pdfIn PDF document text
- http://techscreening.com/userfiles/files/zidotekijapawugudisawe.pdfIn PDF document text
- https://rlmahtani.com/userfiles/files/xasijizeferob.pdfIn PDF document text
- https://justbuymeds.net/userfiles/file/bolobamenoguvis.pdfIn PDF document text
- http://ultrabeauty-ff.ru/userfiles/file/10408840341.pdfIn PDF document text
- http://zonweringbelgie.com/ckfinder/userfiles/files/91006948677.pdfIn PDF document text
- https://beldapromosyon.com/calisma2/files/uploads/34385563424.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/8052385993.pdfIn PDF document text
- http://studiopetrilli.it/userfiles/files/11378075564.pdfIn PDF document text
- http://sieuthibongda.net/ckfinder/userfiles/files/85069004021.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06a8542e6---kixidaxiw.pdfIn PDF document text
- http://eastcoastbiker.de/sites/default/files/file/42065677818.pdfIn PDF document text
- http://www.nagsa.es/ckfinder/userfiles/files/kajigibu.pdfIn PDF document text
- https://atputasbaze.lv/images/userfiles/files/lapovenozan.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140621e59eff---47432405241.pdfIn PDF document text
- http://noithatsah.com/webroot/img/files/vekoleririgumifumixowejuw.pdfIn PDF document text
- http://stefanourso.com/public/userfiles/file/94537968705.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/40783593890.pdfIn PDF document text
- http://tongrentangthai.com/UserFiles/file/bileposujiguzi.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/1375327772.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_off0000bc50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC50	10608 bytes
SHA-256: `2d4fbf5d2627ba519ba005be7ece62cc4985be74d0747b97c3c34d428530519e`
`font_01_sfnt_off0000d452.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD452	16720 bytes
SHA-256: `19b32a5b46872493f28fa23150d67e0f3170d0e6439f284fb1157b35cdd1e665`
`font_02_sfnt_off0000ff34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF34	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011745.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11745	16836 bytes
SHA-256: `645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee`

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