Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9eebd7f621fb3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 17:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57e22ccf30f881ca0860c74932500e7b SHA-1: 3747c5021dcb5bf65fa51426d3e8746de1501193 SHA-256: 99c9eebd7f621fb3ea5ec8e851d556253651e1606d22b9d6bb0f29855ce76a1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many pointing to PDF files on disposable or low-reputation hosts, indicates a link farm designed to distribute malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=install+popcorn+time+android+box PDF link annotation
    • http://sistersaviopublicschool.com/userfiles/file/92190635426.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091521291323.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/bevibi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/sidegokev.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/suximuxo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363748d8d28---27092557122.pdfIn PDF document text
    • http://crm333.com/documentos/file/99031056105.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091975822_855930432.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gitabenit.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/1891330618.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8ed1ba451918b43a3cf980571d98fe90/fovipetadewuniwemukagu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/21408358812.pdfIn PDF document text
    • http://air-con.ru/upload/files/21194811521.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-5/20210905165028144197.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/rigubozi.pdfIn PDF document text
    • http://rinsacars.com/files/others/tulekit.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/kusol.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/xevurulozi.pdfIn PDF document text
    • http://it-hair.com/userfiles/likolodejedume.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/51702555078.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091017181170554.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.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 18012 bytes
SHA-256: 14a3c6ee33842417b8701d1ff344a7396b025d4e532053e77a30d06eeb42221d
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10868 bytes
SHA-256: 91b0748285f5dbee88f82cc6ce417447e4c750a23c41d1371b6964fd9990e7ed

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