Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c50365b64284d…

MALICIOUS

PDF

71.7 KB Created: 2020-12-26 23:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5a8425e6cc1d0fffe65c05a56c20d317 SHA-1: 1e642d889bdb67bdd226878073b246f4dad44e98 SHA-256: 052c50365b64284d8a5b40328fed8432615330f87e171cce68d5e94509b1ff0d
104 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://traffset.ru/123?utm_term=predicting+worksheets+pdf', which is likely the mechanism for delivering a secondary payload. The presence of a visual download button heuristic further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=predicting+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fbd767524896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f9543f1e1b16.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/AhiUheZ/naronowulibibanim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fdc893394774.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/ijgeUjd/fisojuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fd8e1221bb2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fb5ef9d124d7.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/ghaqWWE/88122737707.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/ExiewNf/dosifi.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/mivokozibu/are_cherry_peppers_spicy.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/59375626886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe703f75-ec00-4b40-abb8-f4045f4443e0/gutipot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25adf98d-1d99-451c-846e-0beae486d265/a_raisin_in_the_sun_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/best_tamil_bass_songs.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 5332 bytes
SHA-256: 955990982c049e31ecaae6d0948c238212f479381c0077eb4cf9a40ed4143549
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10388 bytes
SHA-256: e1dd4632b63a14387d7d7122658ee8337d158253b1738ce905eec9e5cd05d4ef

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