Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b3fddc7cafd521…

MALICIOUS

PDF

119.4 KB Created: 2020-04-16 20:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d96edfdafc674093dc64e386fbbb2e29 SHA-1: 6507011af95ff20d2d30793b183619128d34eeb3 SHA-256: 20b3fddc7cafd521ef64ecad54748abc97ac7ac1681b9f0d77681197e51becdf
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains references to fungi and technical details about the PDF generation tool, suggesting a lure or content-masking technique. The primary purpose appears to be directing users to a network of linked websites, likely for SEO manipulation or to host further malicious content.

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://emilyreimann.com/uploads/1/3/0/7/130739159/130739159.html#arthrospores+formed+by+fungi
    • http://propertyaddicts.com/uploads/1/3/0/6/130639449/ladenofedefev_pofaxu_rufeb.pdf
    • http://oman-businesscouncil.com/uploads/1/3/0/6/130604406/9835616.pdf
    • http://theclassyone.com/uploads/1/3/0/5/130590665/8441301.pdf
    • http://tastinggame.eu/uploads/1/3/1/3/131381352/cad8c386a47.pdf
    • http://richlieenterprises.com/uploads/1/3/0/7/130776562/6923d6faab34.pdf
    • http://the5thfox.com/uploads/1/3/0/5/130589121/9bd085b7caa8.pdf
    • http://tiranahost.com/uploads/1/3/0/9/130969375/4058470.pdf
    • http://inspiringintimacy.com/uploads/1/3/0/4/130476339/a57996af.pdf
    • http://couverture.org/uploads/1/3/0/6/130604110/judidipekepeginuleko.pdf
    • http://montanaterritorialalliance.org/uploads/1/3/0/3/130323693/28fcef7311657.pdf
    • http://woodlawngs.org/uploads/1/3/0/8/130814630/1674868.pdf
    • http://hdorange.com/uploads/1/3/1/4/131453872/nasexudeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018589.bin
2e87417c0b33aaf764efd0aa400c58b5b186a0695018e8224ba050711ea284ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18589 10804 bytes
font_01_sfnt_off0001abf9.bin
bfbe4a1f68b3f99633690924a956f7aad60a22b35a44561c0291aa2772b92272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF9 3424 bytes
font_02_sfnt_off0001b80b.bin
d99fc7beff8392d1be196b41497a4e9f2faa5c81ad1e5c2b7d58471bba7459e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B80B 16864 bytes

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