Malicious PDF — malware analysis report

Static analysis result for SHA-256 798ef6efcd7bb068…

MALICIOUS

PDF

68.3 KB Created: 2020-11-11 16:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba2f8314ce7457d8bfcddad19363b2a3 SHA-1: 430fbe63c57efc081aefb416c4eedeaa14e84b26 SHA-256: 798ef6efcd7bb0684593c7523e6edde5f399329fe89c88531959792e3f7d9a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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.
  • 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://traffnew.ru/123?utm_term=practice+writing+cursive+words+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5f95d7f8cee86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f87784418093.pdfIn PDF document text
    • https://dududisekit.weebly.com/uploads/1/3/4/3/134348084/fofutuv_mujawadune_mofibasiwatex.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/2b32a361c93eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f8e1309c78f9.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/5883307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5f93771b4c096.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/18a630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5fa088ab88261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d74f4e05-e266-4d56-9e1b-8b4fcd695687/xekaza.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 5268 bytes
SHA-256: 75ed304cb73cbb919c03a3d752ead26703343b7ce6606bc97d4f004367701779
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10048 bytes
SHA-256: fa05141fb3d4254fa1b6cc77ef0c9ce29e6c49a8702f58febbff02036b5baca7
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3