Malicious PDF — malware analysis report

Static analysis result for SHA-256 57710e64ef8b915b…

MALICIOUS

PDF

29.8 KB Created: 2020-04-04 11:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d21a26957d1224b17d505d5b5911ed33 SHA-1: 337dc170d60e8bdf5fde7d6d7e7afb6c396a4677 SHA-256: 57710e64ef8b915bb7e22936ebc29367053e56d04c053e1afc775d694ec90ca7
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a pattern indicative of SEO spam or phishing lures. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to unrelated domains supports this assessment. The document body, though obfuscated, contains a URL that likely leads to the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://soulfulholistichub.com/uploads/1/3/1/3/131381693/131381693.html#los+mayas+menu
    • http://colddiamnd.com/uploads/1/3/0/6/130603958/5259277.pdf
    • http://masticbeachnews.com/uploads/1/3/0/7/130775929/nudapexemexitudofur.pdf
    • http://torrinto.be/uploads/1/3/0/6/130622093/9136156.pdf
    • http://stpaulaurora.net/uploads/1/3/0/7/130738943/zunetopel.pdf
    • http://10dayscreditboost.com/uploads/1/3/1/4/131437849/1d06e5fc1e.pdf
    • http://mastersonmovement.com/uploads/1/3/0/6/130639123/9d5520d28e6ca.pdf
    • http://observationsandconclusions.com/uploads/1/3/0/6/130621601/duxiso.pdf
    • http://nataliamcabrera.com/uploads/1/3/0/2/130287441/lojasapalitipude.pdf
    • http://dhmmentalhealthcare.org/uploads/1/3/0/7/130775936/5708429.pdf
    • http://bumweiser.com/uploads/1/3/0/3/130324191/4936184.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_off00004df4.bin
874df0a8da5b5dac38700b65783f99bdca77f6e8c3b8adae2c8066b09f5c8814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF4 7472 bytes

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