Malicious PDF — malware analysis report

Static analysis result for SHA-256 12112cd97c7fb05f…

MALICIOUS

PDF

215.8 KB Created: 2010-03-26 16:58:10 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: 176fa5b6dbc10b78a6f21c18f2e4d211 SHA-1: a10b7e45e6d00fbc653b647d415bce846367962f SHA-256: 12112cd97c7fb05f8b4719ce70f49e9ebab815cc11fab4263255c93e3455a659
154 Risk Score

Malware Insights

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

The PDF file contains an embedded exploit targeting CVE-2010-0188 in Adobe Reader's LibTIFF component. This vulnerability allows for arbitrary code execution when the PDF is opened. The ML classifier also strongly indicated maliciousness. The presence of an embedded file and a secondary embedded PDF further suggests a multi-stage attack, likely involving the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

Heuristics 8

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • https://www.verisign.com/rpa
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
5a479ff2881cc991bf2f5e5dffd9080c2332683563d973d5bbbbddf0f58331ed		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x51 13430 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
font_00_sfnt_off00024ab1.bin
0f1f252872efc2e32772676dffd68f503270ca0e788d4f03d223de397dd50589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24AB1 30860 bytes
font_01_sfnt_off000280d0.bin
d8f092193e6f8d13b298d7b4fbc91d434743589e4bb927a023f9cd78a50bc382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x280D0 38812 bytes
font_02_sfnt_off0002d2c6.bin
a149c4462add7ad88cb05f558517cf81cd5ba1ff7c026fd34dcefd18cfea7319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D2C6 51068 bytes
polyglot_child_pdf_off0001cb7f.pdf
8abc6dff8c131ec5afc02051af91e4dc2f04033e7d56be72ca064085cd392980		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1CB7F 103313 bytes

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