Malicious PDF — malware analysis report

Static analysis result for SHA-256 352be108021fd022…

MALICIOUS

PDF

42.5 KB Created: 2020-04-04 10:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea6d733915ed1f2835f1558e61f4c791 SHA-1: 5c77bf6158ca8dfed73a3a65c801fa8d221283d0 SHA-256: 352be108021fd022a5c112df6c09e8ff77fd032a8cdf98aef39b257e265ea349
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to children's stories and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jasmineryan.com/uploads/1/3/0/9/130969631/130969631.html#cuentos+cortos+para+ni%C3%B1os+de+tercer+grado+pdf
    • http://elanbm.com/uploads/1/3/0/3/130313188/2036897.pdf
    • http://bakeline.ca/uploads/1/3/1/4/131408082/cd062aaf.pdf
    • http://atengraving.com/uploads/1/3/0/8/130874365/kewexal_bupig_tixinu.pdf
    • http://electronauticadelta.com/uploads/1/3/0/6/130622041/9262293.pdf
    • http://meraglimholdings.com/uploads/1/3/0/4/130476161/zepulufo-wimaribanower.pdf
    • http://5yearson.com/uploads/1/3/0/6/130604359/bumoribeviwin.pdf
    • http://positivelyfitnh.com/uploads/1/3/0/4/130435978/2300543.pdf
    • http://lubbockseniorphotographer.com/uploads/1/3/0/6/130639768/f0ae1a6ca15.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c5.bin
3e6cb9366b5f9b031d64d7da2a396066776b74ff8fee6fd9455d293d8d1e2188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 8492 bytes
font_01_sfnt_off000084dc.bin
98eae9b279df2ce680d70a4d505064ea756df0c3cbb9cd39c5dd401b12048d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DC 16184 bytes

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