Malicious PDF — malware analysis report

Static analysis result for SHA-256 3115d3b11ffc2ab6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 13:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ea925c0131d0b6097fb785f257cfd31 SHA-1: 1261d3d57d6d18ffdc6c189d4d7cc1702c1c05cc SHA-256: 3115d3b11ffc2ab6f03817f97eaf70b3394b38a80004d6dc59e17190e238db9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF structure and embedded links indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=brown+munde+mp3+download PDF link annotation
    • https://peusch.lu/userfiles/files/85373598396.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/malesomovezixuri.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/70195352630.pdfIn PDF document text
    • https://insp.biz/img/file/79646409701.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/meresebofosomerosevi.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexitidejori.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/22031069075.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/93775836512.pdfIn PDF document text
    • http://greenld.com/userfiles/42794799545.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/gawefozepaw.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kobaf.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/nubon.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/sobutadesa.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/dunurelex.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7fbf23aaf---salotevezukuwon.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/matejazenarokug.pdfIn PDF document text
    • https://soechi.net/userfiles/file/32007339223.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/54149977077.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/83422270363.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/95246235621.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/17266782429.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/bewojomekelalij.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/65843841132.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_off0000ad3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3B 10604 bytes
SHA-256: 5176ca0528d25a4aa150cc54ed5ce87078a2b34b814da694cb6de8b5f7764e99
font_01_sfnt_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16876 bytes
SHA-256: a8258f2221245971e51b9988c51c74cb2d6360efd51bf113aeebb7ac1a7ef5b3

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