Malicious PDF — malware analysis report

Static analysis result for SHA-256 79927f353cdbf676…

MALICIOUS

PDF

66.4 KB Created: 2020-11-21 23:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8620232b41498bb83a43c6ca1e681cd4 SHA-1: 1b32711e7cdf8798b8bd6418047b87f9d54156f0 SHA-256: 79927f353cdbf676a25dea70466f5946c61388400d42b0ba782c1c603501214a
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?utm_term=minecraft+beta+1.6+4+download PDF link annotation
    • https://gepopoxano.weebly.com/uploads/1/3/4/6/134663556/fosenevugekib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fab1d0e2511c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5f95fc878ffff.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/tatafib_gitikok_kebonokosiguxu_gitabezabo.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/609994af-7ef7-4a55-9c4a-775e2eb4d54c/sql_convert_float_to_varchar_drop_decimals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3434c9f8-6ba0-4a52-9bf7-e5372878e8ad/viwumoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03264e65-2d27-4741-8837-4ecb72bb4f02/28733588260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53530525-1747-42cc-95c7-68dd2c428eef/wumuzonakatozegonuwukavov.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/historical_books_of_the_bible_in_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/47620286522.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_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 5400 bytes
SHA-256: c566321f51b88e66bdc5f99d1269ccddffe545aaa461fb9a8cb7897cee797a93
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 9908 bytes
SHA-256: 9f7225d3c1c466374ded58575a973427433d885caec24f9f17f07f8e43f6389c