PDF malware analysis — malicious · cf8071ba810696d9

MALICIOUS

PDF

65.7 KB Created: 2021-09-25 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 43338c878b50c8b0a0567eb887401a89 SHA-1: bfaa5f4114b0415a782227eac60c2f143332c3b0 SHA-256: cf8071ba810696d98bf802f3e6603f775215696c35e8a895ca90be79b2d91279

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a high heuristic score for being a link farm on disposable hosting. The PDF document itself appears to be obfuscated and lacks readable content, suggesting its primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

Nyx PDF Classifier malicious score 0.6253

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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 http://biolabsrl.org/userfiles/files/27442702529.pdf In PDF document text
- https://adminico.nl/userfiles/file/63728427186.pdfIn PDF document text
- http://noticiascgnews.com.br/ckfinder/userfiles/files/60373644777.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/49377280261.pdfIn PDF document text
- http://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdfIn PDF document text
- https://promobryansk.ru/userfiles/files/58690576975.pdfIn PDF document text
- http://paykaaluminiya.ru/ckfinder/userfiles/files/72314324467.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/11455487262.pdfIn PDF document text
- https://mldom.xyz/web/img/podborky/files/sibusunoj.pdfIn PDF document text
- http://healhumanity.foundation/userfiles/file/vitokej.pdfIn PDF document text
- https://garnet-medical.com/userfiles/files/66490171009.pdfIn PDF document text
- http://duoctruongxuan.vn/userfiles/image/file/lupopuluse.pdfIn PDF document text
- https://verticala.ro/images/userfiles/kivofogopoj.pdfIn PDF document text
- http://5m-tti.com/uploads/image/files/31189269363.pdfIn PDF document text
- http://keramann.ru/uploads/files/fotim.pdfIn PDF document text
- http://gearcon-eng.com/file_media/file_image/file/66191883161.pdfIn PDF document text
- https://adminico.nl/userfiles/file/pidubakol.pdfIn PDF document text
- https://alexandrapanayotou.com/web/images/static/file/19295502951.pdfIn PDF document text
- http://xn----7sbev0bhje.xn--p1ai/images/news/file/rozetarovirenigawun.pdfIn PDF document text
- http://yuanjen.com/ckfinder/userfiles/files/dumasisefufumoduliniwan.pdfIn PDF document text
- https://www.edm-medical.net/ckfinder/userfiles/files/31653634110.pdfIn PDF document text
- http://pallenberg-busreisen.de/uploads/files/pizivavik.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=o+que+%C3%A9+um+telemovel+androidPDF link annotation
- http://perfecturology.cafe24.com/upload/editor/imagefile/29397437329.pdfIn 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_off0000af9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c7b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7B6	10732 bytes
SHA-256: `5ffd984c9591aab246b622a9ce353dd6f497a29a3b32196fe001e4de61d5fe0a`
`font_02_sfnt_off0000dfcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFCC	17980 bytes
SHA-256: `97fb8b9e9ac0436cea42fc0edbb38edede6f23c5449bbe1a349e4d673bfdc410`

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