Malicious PDF — malware analysis report

Static analysis result for SHA-256 681c1a99ca416cfd…

MALICIOUS

PDF

69.5 KB Created: 2020-11-25 00:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ffa953b12b0f487fd9d66572c81c9d76 SHA-1: 15a6aae61fea8db805268ce6cb95a54cf18c12b7 SHA-256: 681c1a99ca416cfdf967e53b3f13b87d90efefd892f3cbabd4d9a4ba5a6a781a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV. It contains a heuristic indicating a 'Clipboard command execution lure', suggesting the document prompts the user to paste commands into a shell. An external URI, 'https://trafficel.ru/strik?utm_term=8th+grade+history+exam+study+guide', is present, which is likely the download location for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafficel.ru/strik?utm_term=8th+grade+history+exam+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fbd85269f4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fb7f281a7a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5f90c90dbfad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fa780791fe54.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/darofuzuvo-kuvovujipufasa-xibelal-getafitokoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5fae867bcd678.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/9720499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_5f9aeeba8b5d6.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/ziwunuba.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/77c20e35-5694-4766-9a91-36011729560f/89588072281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119e6cd2-d220-4eb1-acf4-56aefc5f36ed/vudikotidazetonugapi.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ruzoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc227f0e-e620-48da-a588-023fd8ebf50c/lukigibetovafapozogaven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9444dac8-ae5f-48d2-9158-055d4c90088b/zujelujowobeponaki.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/noaa_weather_app_apk.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_off0000c50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 5252 bytes
SHA-256: d1cc43d0a8104867537fbe38523ce86ccb35883e53abaaf3aa54fd19da2c78b3
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10552 bytes
SHA-256: 9cb623923d0b95bf3caf17c9618afbac06c73e2eaaadd3ad34e8e79e2b6cec22
font_02_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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