Malicious PDF — malware analysis report

Static analysis result for SHA-256 4101b869c0b85649…

MALICIOUS

PDF

60.9 KB Created: 2020-11-10 21:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44da59ed5074ba7f5fb74ece8159fcde SHA-1: dd1a788dcb683936a1104b960994805603a78ad7 SHA-256: 4101b869c0b8564976b48e6558eabf41348747d3c72b23b8cba52dfaf0a2cb8a
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://traffking.ru/123?keyword=helix+jump+unblocked PDF link annotation
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/pikumavow-tekedaropegafeg-gufurej-jenew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f8cc4a4487b5.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/64cf9b69ea19bc.pdfIn PDF document text
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/kivifan-zasavijus-reguzudenuzate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f956b76238e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2798a6-9b00-4eb1-9cf4-36bfb79e3c28/69346725347.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/95361259031.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/lobotomy_definition_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/important_days_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/behavioral_economics_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/temotuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/pdf_to_word_text_editor_online.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F7 5044 bytes
SHA-256: 6dc0f88a2083100d9f346f1b590037fd3efd9c4f5f60a2b1080fc986553a27c7
font_01_sfnt_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 10232 bytes
SHA-256: 9bbc6230b2a5be869660eb736371e7a6c50e3050780c72b9f74f63586e56eb05