PDF malware analysis — malicious · 9e31bf99b7ad0f23

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 05:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 66d821155b3db198b81c046e585f76fd SHA-1: cd62650a624feae60b14acd2730367a64bbe25aa SHA-256: 9e31bf99b7ad0f23b821adae4be9c30c0c7ba47100e64dbf70962f0391671d62

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with several heuristics indicating it functions as a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://drafthe.ru/uplcv?utm_term=chipset+snapdragon+662 PDF link annotation
- http://driscollandgibson.com/images/edit_images/file/pewawovagev.pdfIn PDF document text
- https://simpangkanan.com/contents/files/46926814451.pdfIn PDF document text
- http://studiomanzella.com/userfiles/files/niveb.pdfIn PDF document text
- http://dnepropress.net/files/file/nonab.pdfIn PDF document text
- https://xehowo24h.com/images/ckeditor/files/40239857223.pdfIn PDF document text
- https://dpt-mh.com/uploads/news/files/54884587900.pdfIn PDF document text
- http://nwatchonline.org/userfiles/file/ginipotitixit.pdfIn PDF document text
- http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_7E0A6A72C114E9A6.pdfIn PDF document text
- https://livre-art.com/ckfinder/userfiles/files/kotuzanonulis.pdfIn PDF document text
- http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/tegirel.pdfIn PDF document text
- https://norservis.com/files/files/79064297357.pdfIn PDF document text
- http://nsmpublicschool.org/slbdavbatala/userfiles/file/sidimovuve.pdfIn PDF document text
- http://dydlhx.com/upfiles/file///rarujowufiwatezolabekalu.pdfIn PDF document text
- https://gtijsr.com/userfiles/file/begatemapefavasu.pdfIn PDF document text
- http://ambulatorioveterinariosantanna.eu/userfiles/files/fedafalarativilamepufupo.pdfIn PDF document text
- http://tlw.ro/UserFiles/file/verida.pdfIn PDF document text
- http://bernardthevenet.fr/ckfinder/userfiles/files/tixagavotulawilagusodu.pdfIn PDF document text
- https://cyklo-wellness-penzion-palice.cz/content/54312466399.pdfIn PDF document text
- https://dursunguney.com/userfiles/files/zegafi.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/45920370966.pdfIn PDF document text
- https://ms01bet.com/contents/files/12617459193.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8f4b4697---87942247105.pdfIn PDF document text
- https://tes-sys.com/uploads/ckfinder/files/20210902/16305695827652.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_off0000b6aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cebc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEBC	16508 bytes
SHA-256: `dcfce8b5ddf24a30c6c45967e0a6f419e89377974d8c0458d2c41269a2f7a292`
`font_02_sfnt_off0000f937.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF937	10944 bytes
SHA-256: `e7b5b7c62737fc27211c0ddce0e39115108db21d611b5d53a942d49914aad81b`

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