Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5df0443c0942bc3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 10:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 54acb4a9b11a789e9406d0f91994ca50 SHA-1: 241d8689bd8e134d80a4417e6c6a81835f7d0470 SHA-256: c5df0443c0942bc3babb1c56a5ad2e212d4af8d2ed4ed8374d350df0ce8b0dea
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'zajinet.ru', which is likely a malicious domain used to host further stages of the attack. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=2010+camaro+ss+engine+for+sale PDF link annotation
    • https://cdn.sqhk.co/ravawiku/gcjf4gj/family_mysteries_poisonous_promises_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_6024fec2527f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470685/normal_5ff24cb8abcb6.pdfIn PDF document text
    • http://hookup756.fun/walmart_assessment_test_answers_2018he5ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5fcc5c6691efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_605562469c22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ffb7e7a03b45.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/h5gemje/38945544323.pdfIn PDF document text
    • http://nutristrike-shop.ru/tavixewosfdrc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68bb6bd271.pdfIn PDF document text
    • http://twoup-viktoria.online/69945227017erxxb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445115/normal_5fe0a0f55fdc3.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/bipakujokuxaginusomag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_602ce1aeb5051.pdfIn PDF document text
    • http://tidexozi.22web.org/aws_cli_cloudformation_validate_template.pdfIn PDF document text
    • http://mevolufasizi.22web.org/friends_monica_richard_answering_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412606/normal_5fc7ae98aec0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_604db975ce4d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://menimilerawapo.rf.gd/grade_1_math_symmetry_worksheets.pdfIn PDF document text
    • http://titugol.atwebpages.com/55555319563.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/49754057097.pdfIn PDF document text
    • http://wififeju.atwebpages.com/how_to_use_safety_1st_humidifier.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5140 bytes
SHA-256: 60d6d3eeace27668e8feba792552ab5161380117a33708e1fc62b4975b5fe092
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 11084 bytes
SHA-256: 3fb2517b748881b13bdc44c982ebbbebb3d2364259fc328dcd709b059d82f4c9
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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