Malicious PDF — malware analysis report

Static analysis result for SHA-256 b825b3ddf3a9a6e8…

MALICIOUS

PDF

68.1 KB Created: 2020-12-19 06:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b695f45b28b476644d29365d4017f8ad SHA-1: bb8a1b263390ea4b35780356fe1afb504f12a8ce SHA-256: b825b3ddf3a9a6e8001b67b9980e145431e64909ab2f9669bbb11131bf715a95
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a "study guide", aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=the+great+debaters+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5f8cf135abab6.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/6f8c5123-caa5-4e83-9417-229bf1c2b01a/rough_guide_northern_germany.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/10443203828.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51a9dbe9b69395125fe2b/t/5fd18756071bbc688022ceca/1607567190801/30759549018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46633f5-e833-43ce-824b-986217aa76c0/pilap.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/gibemu.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/94341463513.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/glow_plug_relay_7.3_powerstroke.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/ayyappa_songs_malayalam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5662fea4a794d56634e63/t/5fd07294125f6a657a4d678a/1607496340928/watezujokapos.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/2274353357.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29a703dfdd95b60dff67e/t/5fc9a73e414f5e352375ada1/1607051070850/98233763565.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_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 5248 bytes
SHA-256: 70c0c3f78cd81b05e51a0378eb2635c4f80919ed92d3c05f16436a1ebac1480a
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10292 bytes
SHA-256: 716884565c1d663defb8112e71dd9a5b4601f4e74ae5a1cebe881b7a0b1f6ef2