Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42f6fa13676cf7a…

MALICIOUS

PDF

38.3 KB Created: 2020-11-09 11:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79d8d9fbc46d38d222ae2666330fb0c3 SHA-1: 82dbf84fc5242c1c685c65fa0040d3178d5af5f1 SHA-256: c42f6fa13676cf7aaada0bbc83eb1a1088ba650d3f010a0e50c3ebb3f6ee9ef4
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including one to 'https://trafficel.ru/aws?keyword=manual+for+singer+4411', disguised as a manual. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/aws?keyword=manual+for+singer+4411 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5f9e3b1b95957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_5f8e6c3b39a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5f98f2b33a78b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9f60c389e91.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/b734173af84.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/wupelofagutu.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/4933895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wiburowugivu.files.wordpress.com/2020/11/81465180138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd0ea91-1828-46f5-b7a3-60dd9d41cad2/leradomufunasuxegafuso.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2de216-7738-43d7-94a4-cfd21382c34e/my_very_own_lilith_guide.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_off000052ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52CA 5080 bytes
SHA-256: 940cf194fd6b956ca2c0c563937141c140574c2454104f56e345582a9d2c24a7
font_01_sfnt_off0000643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 14596 bytes
SHA-256: 3204c47a1ae90836e8cff426aba9b34a9d69ede94a7a1723325b94a93f01b4d4