Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cbecfcd1571f23…

MALICIOUS

PDF

63.8 KB Created: 2021-01-04 01:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f8e7254b3868cd0f935695573f39ed32 SHA-1: 01bd5f15117e26c1dd1c55a2863675a7385ee377 SHA-256: 92cbecfcd1571f23cf81b5a7f6b92b60f8674c9eb2f489e70510ea15170e6492
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a payload or visiting a phishing site. The document body, though heavily obfuscated, suggests a lure related to an 'installation manual'. No scripts were extracted, but the presence of an external URI is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=fisher+homesteader+installation+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5fe46e6cba615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5feb02ff2b32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5fc07b49712a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5f9ba2911aba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f8e292964c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fbf19c8e7954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_5fb2a4a1b9c23.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/buponuwebi/kisaxunojer.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/sowumokize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafacf0e-2b32-4521-9590-10238ebd35f3/62660012372.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/30859613353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae72fcf-2ea5-4e28-b27c-9a5ceda89a37/eye_color_guide_acnl.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_off0000be3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3D 5020 bytes
SHA-256: fb37624eead915d8f0cae7de879dcf1088d68c3e04f997888327d364b7b43c98
font_01_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 10476 bytes
SHA-256: 224e138bf104a26d8bfcbc7078f1003e3fb961df5847f9cf7082c7699f1724c8