Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9a0354bc416e99…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 19:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31026e76565ebced7feb33f0e5c0b1cf SHA-1: 9e60ba2691837cf943df8cf1c9a0fd53ff79447b SHA-256: 3c9a0354bc416e9926d118a9aa7eb2243b1bc62887431055000c43324987e619
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'How to fire up a oil boiler'. A key indicator is the embedded URI pointing to 'https://druttle.ru/123?utm_term=how+to+fire+up+a+oil+boiler', which is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing or social engineering attack.

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://druttle.ru/123?utm_term=how+to+fire+up+a+oil+boiler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6026c5ac58b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_60217df443a9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fcc80120448e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60184f021c5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5ff873aea6347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_601627d5e917c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_60299425dc4ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_5ff8d95fe5f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_6007d0a0470bd.pdfIn PDF document text
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/b12e5c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_60055ba7cfc5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ff935c28c957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff680398ab7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doruxujegajaso.rf.gd/74089489975.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/ebay_android_cell_phones_unlocked.pdfIn PDF document text
    • http://ditiruvovuluka.epizy.com/voniwidelizemo.pdfIn PDF document text
    • http://bibirosomuxir.epizy.com/3314009674.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 4908 bytes
SHA-256: 8d02cb4b6cdef8f50f30d67b8eb40e94f7964080d28f24531e16d005a27ae982
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10440 bytes
SHA-256: 574a3a4906bc51c414451203160c6c01e12ec0697ea8e8980dbdd4cbbfa113c1

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