Malicious PDF — malware analysis report

Static analysis result for SHA-256 e868b79d02e829fe…

MALICIOUS

PDF

75.0 KB Created: 2021-02-12 21:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 166860a047f79120928e2c83aea8f6f9 SHA-1: b3298754e38881f357e527b40b4b6c3d44f422da SHA-256: e868b79d02e829fe8d5b1445c5bc5dd343df536e2261675a2a3ddc5fdd4fcc59
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or distributing malicious content. The 'SE_CLOUD_DOC_LURE' heuristic further suggests the document impersonates cloud services to trick users into clicking these links. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://yafferge.ru/123?utm_term=multiple+accounts+2+apk+download In PDF document text
    • http://generatorsale.ru/236696571413p43r.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/823066.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/ronil_sobukidam.pdfIn PDF document text
    • http://blu-ital.space/tafuvimemuizwbz.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/pubav_bemibe.pdfIn PDF document text
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/jorenajanurex.pdfIn PDF document text
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/ba363eedee8070.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/92c00f7d8acf21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/bulujono/45755605712.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/seliponanevowemuz.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/wavolonugoramonijarobe.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/caustic_ingestion_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/pifumunivat.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/fodeberop.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/checkbook_guide_to_federal_health_plans_2016.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5264 bytes
SHA-256: 584658c4367a5afe953bc6bff85c56d14c274d45833ec2b69ee45025e61d0f92
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_02_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10660 bytes
SHA-256: 88428ba9ce882ee3db86343ded072181ec0ae3206fe95e7ed28aacaea5c7cf4c

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