Malicious PDF — malware analysis report

Static analysis result for SHA-256 994ddec35c745631…

MALICIOUS

PDF

38.4 KB Created: 2020-06-01 20:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef19b886d5c510bc7e03cf1a07715c1b SHA-1: 8c5500772b13a9c30b49446b952ec3fc458d4c71 SHA-256: 994ddec35c745631ff05c03d4f976d74f2e609dee806eeb78d2e0bf06af3ee66
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, a technique commonly used to redirect users to malicious websites. The ML classifier strongly indicated maliciousness. The primary attack pattern involves leveraging these links to potentially deliver further malicious content or phish for credentials. No scripts were extracted, limiting the analysis of direct payload execution.

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://armorgrind.org/uploads/1/3/0/7/130775702/130775702.html#instant+street+view+com
    • http://donovankleintv.com/uploads/1/3/0/3/130324119/6c117fd9f31c76.pdf
    • http://heathermckenziemusic.com/uploads/1/3/0/7/130776416/260d8f1d6db6.pdf
    • http://everybodyreadsbarefootbooks.com/uploads/1/3/1/6/131606454/f3c66964606.pdf
    • http://mamakea.shop/uploads/1/3/1/0/131071117/3805e67c5904.pdf
    • http://takeakne.com/uploads/1/3/1/1/131163744/jitemozogojo.pdf
    • http://armorgrind.org/uploads/1/3/0/7/130775702/terms.html
    • http://armorgrind.org/uploads/1/3/0/7/130775702/dmca.html
    • http://armorgrind.org/uploads/1/3/0/7/130775702/policy.html
    • https://lesetexu.files.wordpress.com/2020/05/25240335757.pdf
    • https://bifariki.files.wordpress.com/2020/05/sififuregotepipugewudazi.pdf
    • https://lebavop.files.wordpress.com/2020/05/mafamasam.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_off000056a8.bin
f79c6afa69b7cd61772f24f5239a4d13c9548bad65825bf4d2532989e6b8cb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A8 10128 bytes
font_01_sfnt_off0000795b.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 16204 bytes

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