Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a549eeac4de662…

MALICIOUS

PDF

69.3 KB Created: 2021-01-24 08:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ec9bf516e8d8a4a001b0a04ae06e1204 SHA-1: 23669758bcb7acaaa732c2425dcf08fb202de0f3 SHA-256: d8a549eeac4de6621d9d6f8291918e50295ac5a6874b0f61619e3bbd22b00a4e
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by both heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to 'winning science fair projects high school', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=winning+science+fair+projects+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5fd15c172602a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff2ba5021db5.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/geAB92W/digestive_enzymes_for_dogs_eating_poop.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/liaf3FL/61368165230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ffeb43ff1cc6.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/future_simple_negative_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff81aebbb803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_6000f9912753a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd6ad71ef1a2.pdfIn PDF document text
    • http://ludokebisiw.iblogger.org/restaurant_armentieres_guide_michelin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_5fd6625341ede.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/tejuvonixag/daxoxusagowor.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/mibumaz.pdfIn PDF document text
    • http://merizipu.rf.gd/laxuwufexux.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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 5368 bytes
SHA-256: e229287839129c3224d4b398dba18546e1c446e5505010714041ff3c544b9acf
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10184 bytes
SHA-256: 73e14370ac01dfd728616830b6c5696d61be9eb6a462e837f20626fb379f10c8