Malicious PDF — malware analysis report

Static analysis result for SHA-256 3463103b2a4a5d39…

MALICIOUS

PDF

36.9 KB Created: 2020-05-31 15:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36632244f39a3607ef34a89e4b90224d SHA-1: 3ac7370e214d20b0a65f9a0139cf4e215e25a985 SHA-256: 3463103b2a4a5d39f3d74ffb67de315fcacfafc770201f2c951080bd233ac48e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of outbound links points to a likely attempt to drive traffic to potentially compromised or malicious web pages.

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://keatingphysicaltherapy.net/uploads/1/3/0/7/130739646/130739646.html#vegan+food+list+south+africa
    • http://mercymedicalarts.com/uploads/1/3/0/7/130775762/vuwaje.pdf
    • http://stoneedgesharpening.net/uploads/1/3/0/3/130323207/buzafusivafuvafires.pdf
    • http://mrgraduation.com/uploads/1/3/0/5/130540604/c9cc2b7.pdf
    • http://velohnger.com/uploads/1/3/1/4/131453695/1382920.pdf
    • http://southern-charm-yoga.com/uploads/1/3/1/8/131857690/8c18c18.pdf
    • http://luxuryinteriorphotography.eu/uploads/1/3/0/2/130288483/457a631e5.pdf
    • http://lauraweber.org/uploads/1/3/0/4/130476850/zatejodejukobesut.pdf
    • http://snowsportequipment.net/uploads/1/3/0/4/130435905/3925893.pdf
    • http://performanceinc.club/uploads/1/3/0/5/130539818/1d379d89ba371.pdf
    • https://jupeveni.files.wordpress.com/2020/05/muporifosifare.pdf
    • https://kikibok.files.wordpress.com/2020/05/romuzarapatinodovapogad.pdf
    • https://daritawaba.files.wordpress.com/2020/05/22425277555.pdf
    • https://remopar.files.wordpress.com/2020/05/pofalegubilogem.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.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_off0000653f.bin
5d27914bc6578e92c1b72d4a217282879d3c971e1230ff0b851bc9b6a23c9e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 10328 bytes

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