Malicious PDF — malware analysis report

Static analysis result for SHA-256 a376837c79aa2f52…

MALICIOUS

PDF

73.0 KB Created: 2021-05-18 04:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cb2a14d2cd95a292b94f87bffae3b142 SHA-1: 27ef433cd8f4444733a36028422a95b03b59246a SHA-256: a376837c79aa2f52d845514af6880d1c68a52b95bebf23683e3d9d8248f8e6da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL leading to a site offering a 'brick rigs game free download'. This suggests a phishing or malware distribution attempt, masquerading as a game download. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=brick+rigs+game+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406213/normal_605a054f3f564.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/8b377116ee0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_603ed103c08c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_601e59d12c032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_606c78773ac3f.pdfIn PDF document text
    • http://fotuxeji.iblogger.org/42420814329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_60594212a0337.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/5c7cd68d738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5ff88ec773a6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5feb640b3f212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5fcbaa93972b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_600cb3e6326da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fcfb140e33e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_604d45a9676bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidozex.epizy.com/zimsec_a_level_economics_notes.pdfIn PDF document text
    • http://moseligukunevuz.epizy.com/jorozusijeda.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5544 bytes
SHA-256: 932e6b9719d07e1c641bc34364e7da29afca14ec130ba9b8955ca301e5da9400
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10900 bytes
SHA-256: ea7360cf9fd7a98c1f2b260692b699721a645f53d35c749f8e114bc5d37848f3

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