Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb531878a5ecac6c…

MALICIOUS

PDF

65.7 KB Created: 2020-06-07 07:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc6de6dc4a29fbf539be7c8f7e771be SHA-1: cd3b94b3aeeb3bd46640ad4f0f996e21a867ca91 SHA-256: cb531878a5ecac6c405ddb0879ba1d5fce512e47450bb87894f4cd49ffd3e5d0
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though partially corrupted, contains text suggesting an immigration law office, likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attempt.

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://windows-defender.com/uploads/1/3/0/2/130272877/130272877.html#escrit%25C3%25B3rio+de+lei+da+imigra%25C3%25A7%25C3%25A3o+de+ro
    • http://crccoastreliefclean.com/uploads/1/3/1/4/131438110/jomimejonijiviju.pdf
    • http://stefdesign.net/uploads/1/3/0/8/130874666/fomawemijegezomosi.pdf
    • http://thewebbargain.com/uploads/1/3/0/7/130738854/8950768.pdf
    • http://princetonfootandanklecare.com/uploads/1/3/0/6/130620888/1164d77.pdf
    • http://youngandup.co/uploads/1/3/0/8/130814675/6dda20e29c77a.pdf
    • https://sejidinaduk.files.wordpress.com/2020/06/rurozepivek.pdf
    • https://sunederaxi406707068.files.wordpress.com/2020/06/59849813549.pdf
    • https://desebiwago475772337.files.wordpress.com/2020/06/bumikaxurogosofejowo.pdf
    • https://bivuwid.files.wordpress.com/2020/06/pidejinopasulupugenawuv.pdf
    • https://womemoz.files.wordpress.com/2020/06/taxelozugitak.pdf
    • https://sezibaz.files.wordpress.com/2020/06/38230604839.pdf
    • https://gubobag.files.wordpress.com/2020/06/83228871820.pdf
    • https://zidimamokad339045790.files.wordpress.com/2020/06/48879026529.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_off0000cf61.bin
e2936bce23414f6d35f71a0b90ff15ecd0427ec9aaeeb11dc9a89f97840276f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 14588 bytes

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