Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12a2fa5a238f78c…

MALICIOUS

PDF

39.4 KB Created: 2020-05-20 12:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74eb098a08d89a6787268f53511e494 SHA-1: e4a964538b5b25275bcf2da4df10ffabfe85dc54 SHA-256: b12a2fa5a238f78c5f8062e6966d4cdbaa8f6f6f01b9875b970c7f781a0c7950
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The document body text is heavily obfuscated but contains references to some of these URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://irieint.com/uploads/1/3/0/6/130604633/130604633.html#cryptic+quiz+answer+key+page+203
    • http://lawnplusproperty.com/uploads/1/3/0/6/130620365/3678a47.pdf
    • http://broaddusgoddess.com/uploads/1/3/0/8/130874262/db11d5d4.pdf
    • http://lifereflectionsbykaren.com/uploads/1/3/0/5/130550956/89e6f9c83b55.pdf
    • http://herdel.net/uploads/1/3/0/2/130273791/07ecc37db58.pdf
    • http://itsabouttimetlc.com/uploads/1/3/0/8/130815664/8219598.pdf
    • http://natewilsonforfrederick.com/uploads/1/3/0/8/130814636/rumuteguref_donoke_fikapepegaxera_daxaloz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006665.bin
91cef91a73a4c1783db86b84fc8801fae4a9dff5257ac9f13888227f37ce488b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6665 13556 bytes

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