PDF malware analysis — malicious · 307940aef85b748f

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 02:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 2d70f2f5098135364392547be0f3681e SHA-1: e289f5ff9e101fc874a76d0e1074615ce3be192a SHA-256: 307940aef85b748f4451f21a611fa491693ac3bf9c2f5e26f46799465170edc1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=nova+launcher+set+wallpaper PDF link annotation
- https://pianotuningdarwin.com/userfiles/files/76177660229.pdfIn PDF document text
- http://24cvety.ru/upload/files/xafopimukarixevov.pdfIn PDF document text
- http://sahcarpets.com/userfiles/file/86018598573.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1bbbae66---82849647330.pdfIn PDF document text
- http://seosanhrd.com/userfiles/file/volubawiloli.pdfIn PDF document text
- https://prevodi-plovdiv.com/userfiles/file/xokagikupubudodogukelir.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/vutivujalozofoxogoxada.pdfIn PDF document text
- http://reklamavysocina.cz/UserFiles/File/44202596473.pdfIn PDF document text
- https://naucharts.com/ckfinder/userfiles/files/xejubefexujasate.pdfIn PDF document text
- http://medwin.kr/userData/board/file/89288704141.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8da6591e5---54964468116.pdfIn PDF document text
- http://generaldistco.com/images/file/vefavipo.pdfIn PDF document text
- http://lokalizacja-gps.pl/userfiles/file/44618788918.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///20210909193724_148584142.pdfIn PDF document text
- https://petala.gr/userfiles/file/72909194912.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/namexezepodutobitofozi.pdfIn PDF document text
- http://speckletrack.com/update/editor/file/99696853334.pdfIn PDF document text
- http://grasslandtj.com/upload/files/75739622040.pdfIn PDF document text
- https://tw-itemaos.com/ckfinder/userfiles/files/xuwawamufowevogemagofa.pdfIn PDF document text
- http://www.pranabkumar.com/fckimages/file/81511464205.pdfIn PDF document text
- https://unaizahic.com/Files/files/sunumelumozalujotegu.pdfIn PDF document text
- http://delfosventures.eu/userfiles/files/vabebejaziw.pdfIn PDF document text
- https://raiporjai.com/piceditor/file/7438073487.pdfIn PDF document text
- https://franchiseharbor.com/files/files/zabitote.pdfIn PDF document text
- https://alutat.com/data/file/67311200540.pdfIn PDF document text
- http://michalpavlicek.com/uploaded/file/67895165492.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_off0000e7af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFC6	10608 bytes
SHA-256: `69bb6fd39f551d40c32ef42581d5832937581bc3b4f000b7fb1927ce2b04e7bd`
`font_02_sfnt_off0001181d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1181D	18280 bytes
SHA-256: `1ea503d0e8c59c4fa296587a715fb5ca66aa0ede9a6ca5d884b0bf5a221e4d6b`

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