Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59c0f67ac7ac4f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-04 04:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ae80c73ae320f48a59bc86213bbac27b SHA-1: 6fa1654acedd981a6f0894569a0de67447fbfcb6 SHA-256: cb59c0f67ac7ac4f3066e3f34bd9c5bbc7f5740784f303530391d08ed31d407e
144 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicate a high probability of maliciousness. The document body, though heavily obfuscated, suggests a lure related to an 'interdependence worksheet'. The presence of multiple external URLs, some pointing to PDF files, indicates an attempt to download and execute a second-stage payload. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing further suggests the potential execution of commands, possibly involving PowerShell, to facilitate the download.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/wix?keyword=interdependence+worksheet+ks3 PDF link annotation
    • http://creampiepow.club/fomopagaziquef6.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/vajojipizebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_6013f17c58446.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/AEggiqD/doganudejaro.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jbCeSig/numifov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_603291edcbbed.pdfIn PDF document text
    • http://volosaty100.xyz/20853373993krv0r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fccd0ebd7bc4.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/powershell_5.0_download_windows_7_64_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_6022bf6d378cb.pdfIn PDF document text
    • http://biomanix.best/54580634947mwiyb.pdfIn macro / runtime command snippet
    • http://xorabawik.medianewsonline.com/89473235550.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6016cd5acff33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fde3caa3c43a.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/xijuxosisomuna/91248471349.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/lugewegodomevogaj.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/6022342078.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/12537053914.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5176 bytes
SHA-256: f98db36614476f750e3204afcce917694115bc03d4379864a2fc1e65ef28c455
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 10196 bytes
SHA-256: 3829db740cc29c71c9db40b58da6adedf840e93c1bcd9e4c8cf115a8efb0b71b
font_02_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 16088 bytes
SHA-256: b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e

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