Malicious PDF — malware analysis report

Static analysis result for SHA-256 452e3cea59c4d500…

MALICIOUS

PDF

66.5 KB Created: 2020-11-30 20:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d5744cdb20d8bcea4cc9a1700fa3b937 SHA-1: 58b805ec563e30cf3a3577f5b9ed7a1e52ebb4c3 SHA-256: 452e3cea59c4d500f90f59e9593ecd683efb2d37982f9b5b503a989af28fba9b
104 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'traffset.ru', which is likely a malicious domain used for payload delivery. The presence of a 'download button' heuristic further suggests a lure to trick the user into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=lame+encoder+dll+audacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409619/normal_5fb72e3fed91b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_5fc31dee5da46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fa212e0354b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f952be8446d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fa65d8499825.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
    • https://uploads.strikinglycdn.com/files/57e33d0d-b23e-4df5-bdde-68966e079b72/mice_and_men_file.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef1d1491241adc443c2d/1606217501823/convolution_example_problems.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10afc403f5353fd968892/t/5fc14dff4e98326c0240a122/1606503941713/public_relations_agency_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce456ef-9903-4e47-b236-f52409b1a695/nekuxel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff2111f6a4198480a438/t/5fc152035147b14804648ef4/1606504966615/50623188482.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/us_history_staar_test_2019_high_school.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bfaa8787e879896b3d28/t/5fc23a352dd96f5918388f13/1606564405221/adventure_time_songs_ukulele.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_off0000bbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEF 4832 bytes
SHA-256: 41daba87e22696e47eaa694cc1d3d11367f834a92b79ccabd0e756c1dc88aeb8
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 10352 bytes
SHA-256: 18ce0d301b4e7d3668b320282c71483ccc7d9a5c5e1b93818f5388d2ff2f8601
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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