PDF malware analysis — malicious · 586bf9b75a441437

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 11:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: d8dd49547512a90c7203dd06c3086b7a SHA-1: 364498e9eb8daeaf3a755bf65372a88300d44091 SHA-256: 586bf9b75a44143751ecd3acde59f53df47aef4dc1476643974ae8976237a023

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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://shastriratanchatterjee.com/ckfinder/userfiles/files/73602286169.pdf In PDF document text
- http://pttaccounting.com/userfiles/files/ragukigi.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec860a059---58600343621.pdfIn PDF document text
- http://tnshoppingbag.com/upfiles/file/gemovirizekuvelazetegijon.pdfIn PDF document text
- https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64931331807.pdfIn PDF document text
- http://emrc.ie/upload/imagecontent/file/firibof.pdfIn PDF document text
- http://toyotarent.tw/FileData/ckfinder/files/20210912_F365D441266B9DA3.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/72611020740.pdfIn PDF document text
- https://wonwon.taipei/photo/file/16150436289.pdfIn PDF document text
- http://thaide.org/userfiles/file/81931411500.pdfIn PDF document text
- http://boras-sjuharad.boj.se/uploads/userfiles/files/zexiga.pdfIn PDF document text
- http://saovietgroup.com/upload/FCK/file/86644781822.pdfIn PDF document text
- https://laser123.com/geektic/files/9074167685.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52881756761318166dba92.pdfIn PDF document text
- http://richmediahouse.com/admin/uploads/file/42640487870.pdfIn PDF document text
- http://thetsaban3watnuea.com/UserFiles/file/93242608032.pdfIn PDF document text
- http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
- http://clinicaveterinariabilancino.it/userfiles/files/59309183958.pdfIn PDF document text
- http://esipro.fr/userfiles/file/53700857128.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332f5581810---92486773256.pdfIn PDF document text
- https://e-tta.com/app/webroot/userfiles/files/daretedezugameni.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1630697380.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vanced+apk+download+youtube+vancedPDF link annotation
- 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_off0000d93d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD93D	18192 bytes
SHA-256: `f79883f722bf1ba949cead7acebaefe21f27306c4cf6a64718b12bc04c7811d9`
`font_01_sfnt_off000108bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000120d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120D2	10716 bytes
SHA-256: `4196a8186fbaab30fde3198d936dba224c9e19ce40c4bd9049f8ff7281e73c5a`

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