Malicious PDF — malware analysis report

Static analysis result for SHA-256 b213196feaaaa490…

MALICIOUS

PDF

75.1 KB Created: 2021-02-11 02:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 75bb8fef2ffe8b5b2669987b2d9d1277 SHA-1: a039f9178472c35628cd0e2375e7063bfe2c6d97 SHA-256: b213196feaaaa4908d8f6b0adb1a770c19cf7615061bf3eda10173a6594b12d0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a phishing or malicious content distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=dragon+priest+skyrim+locations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fcf59ba58b44.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/zafaxonugorejuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_60029446b743e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fee0e31e35ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_601e4d787b624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368991/normal_5fe0284ea79e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_602454fa35e01.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/jekedow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/whatsapp_for_nokia_e63_2018_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/keystone_resort_grooming_report.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5420 bytes
SHA-256: 6ca88bf293c5d34ead5629e2f3fe97f5ba707f1b11c1cc64262fcfcdf3694126
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10600 bytes
SHA-256: 928f0f5a187ceac7ffd90347d51c0510b871489367f50400f6735d22e5da5ede