Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4abacfbc31b3923…

MALICIOUS

PDF

513.4 KB Authoring application: Kvojivedcoci (via Kelepiqomozmo) First seen: 2015-09-30
MD5: 84594d65334a8dc778703afd4c9bd3a0 SHA-1: b1a1b85759dc966e2799f8f8eec7dabbb1581e32 SHA-256: d4abacfbc31b39237613a0f3240668b55d24cf1287efbed85e65efded446aa0b
68 Risk Score

Malware Insights

MITRE ATT&CK
T1566.003 Phishing: Spearphishing via Service T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The SE_CALLBACK_LURE heuristic strongly suggests the document's content is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no specific malicious URLs were identified beyond benign ones and one unknown, the presence of JavaScript and the callback lure pattern point to a social engineering attack. The document body itself is heavily obfuscated and does not provide clear textual clues, but the heuristics are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ns.InsiderSoftware.com/fontlist/1.0/ In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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/sType/ResourceRef#In PDF document text
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#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://www.iec.chIn PDF document text
    • https://www.verisign.com/rpaIn PDF document text
    • http://ocsp.verisign.com/ocsp/status0In PDF document text
    • https://www.verisign.com/rpa0In PDF document text
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0In PDF document text
    • http://www.microsoft.com/typographyIn PDF document text
    • https://www.verisign.com/repository/CPS��In PDF document text
    • https://www.verisign.comIn PDF document text
    • https://www.verisign.com/repository/verisignlogo.gif0��In PDF document text
    • https://www.verisign.com/CPS0bIn PDF document text
    • http://www.microsoft.com/truetype/0In PDF document text
    • https://www.verisign.com/repository/RPA0In PDF document text
    • https://www.verisign.com/repository/verisignlogo.gif0�In PDF document text
    • https://www.verisign.com/CPSIn PDF document text
    • https://www.verisign.com/repository/CPSIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
icc_00_off00041cfc.icc pdf-icc-profile PDF ICC profile at offset 0x41CFC 3144 bytes
SHA-256: 2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e
font_00_sfnt_off00003d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D53 62160 bytes
SHA-256: 5f96e1e90c4ef56487c91d02c05141dca0967f8e2bbd5d67be6c4f381f0afa79
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 71216 bytes
SHA-256: b661c2e877dd6b7625208ae148d736aedb24eda2d4f014262cbb7f958f538ca0
font_02_sfnt_off0001a204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A204 11156 bytes
SHA-256: 8b62f203a4ab5c2ac76368029c584b4fa12fffc17f3b6e4e43a9997416807d21
font_03_sfnt_off0001c1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1B5 37232 bytes
SHA-256: d375c22ace40f0b973d7308d85023b2e0e49d40dc51da45552d116868346475e
font_04_sfnt_off0002300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2300C 46764 bytes
SHA-256: afeb9e1e920aae3aca3f295f1bbccba46b16423dac14b1b5fde4b661de9198cc
font_05_sfnt_off0002b887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B887 22628 bytes
SHA-256: 95592346b00d039686aa3d7e22eae3d52b011e7e842a5c123f73e89ea766cd35
font_06_sfnt_off0003792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3792E 32640 bytes
SHA-256: 6cf6df6beee88aa138f821122d0c1969b348cebe09cafe5b5f6a7eb8c27107a0

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