PDF malware analysis — malicious · c5e5efed63f63c16

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 14:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b537ee92f3581d3332cbe3c5a0b3a1a9 SHA-1: ed20701309b2c86d8626d1efb6d962c7a246e3dc SHA-256: c5e5efed63f63c165b8b46d652d4ca94350b3aa9859a3cb7cd5cab13b0b31def

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate it's part of a link farm designed to obscure the final destination, likely leading to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://medvor.ru/uplcv?utm_term=photo+editor+pro+cartoon+effect+mod+apk PDF link annotation
- https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/93685608138.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/15844042170.pdfIn PDF document text
- http://newkontakt.ru/userfiles/images/file/walidajofijakumigaviku.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161380aa2adf63---14970278879.pdfIn PDF document text
- https://callmarkinvestments.fortunekenya.com/callmark/files/89299268704.pdfIn PDF document text
- http://koreabulk.net/userData/board/file/fenesozeseg.pdfIn PDF document text
- https://aluminiosarla.com/userfiles_arla/files/rodibekuramokolix.pdfIn PDF document text
- https://ta-taiwan.com/app/webroot/userfiles/files/28806027177.pdfIn PDF document text
- http://avon-bratislava.com/files/files/suxuzusemolanidewirimis.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137adb6ef734---ligupedib.pdfIn PDF document text
- https://bulgariapools.com/contents/files/gikemibozimojulapar.pdfIn PDF document text
- http://vigova.vn/Images_upload/files/98771408485.pdfIn PDF document text
- http://xn--49s538bo8ux8c.net/userfiles/file/81804109493.pdfIn PDF document text
- http://balletpanov.com/uploads/files/nutifisa.pdfIn PDF document text
- https://markapin.com/calisma2/files/uploads/xegemezijekakiposejoxofu.pdfIn PDF document text
- http://metzlerranch.com/userimages/notepidiwumefepake.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/68639345924.pdfIn PDF document text
- http://wojno-stal.pl/pliki/file/91975502659.pdfIn PDF document text
- http://bitree.net/ckfinder/userfiles/files/gatozonar.pdfIn PDF document text
- https://hgb.se/filer/file/pewapemuzijixelorimel.pdfIn PDF document text
- https://jagominum.com/contents/files/11362888649.pdfIn PDF document text
- http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/92180561798.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_off0000cd9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD9C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e5b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5B3	10764 bytes
SHA-256: `6071595c9cc6b32a57e7e915088dbc837c51d0d6aadec02d1fd94b754a6f4f1e`
`font_02_sfnt_off0000fe43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE43	18972 bytes
SHA-256: `4d02f8f1109227d7055ace8cde1ea33b1ee015f42daed414159270529fabcaec`

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