Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afaa0caf92aa769…

MALICIOUS

PDF

49.3 KB Created: 2020-05-02 18:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f379ecca05cabe22f1083a9c791f15d4 SHA-1: 0704e778ed88a31a7c5e171572d5bf4bf408634c SHA-256: 4afaa0caf92aa769cc099583550e475ca524aec6b6ece87e9614ab7ac9b45685
94 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, indicative of a link farm or SEO poisoning attack. The embedded URLs, such as http://rockandrowel.com/uploads/1/3/0/5/130542907/130542907.html#causes+of+unemployment+in+zimbabwe+pdf, are designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rockandrowel.com/uploads/1/3/0/5/130542907/130542907.html#causes+of+unemployment+in+zimbabwe+pdf
    • http://tuorent.it/uploads/1/3/0/3/130313038/fuxogerumagisa.pdf
    • http://sophiecoach.org/uploads/1/3/0/6/130620470/kubesojemofoj.pdf
    • http://renatavoci.com/uploads/1/3/0/9/130969871/8230405.pdf
    • http://frostiesshowjumping.com/uploads/1/3/0/4/130477234/dccc4ed1.pdf
    • http://bestvalueinterlocking.com/uploads/1/3/0/9/130969476/2849327.pdf
    • http://noideers.com/uploads/1/3/1/3/131380651/9883594.pdf
    • http://nwawindowtinting.com/uploads/1/3/0/2/130287482/4881344.pdf
    • http://australianbabyproducts.net/uploads/1/3/0/3/130313035/1183d0f121c51a.pdf
    • http://fullflightcounseling.com/uploads/1/3/1/6/131637719/wiraguv_wositu.pdf
    • http://vipcleaningservices.org/uploads/1/3/1/4/131437660/8893276.pdf
    • http://svinebanden.dk/uploads/1/3/0/2/130272851/lavir.pdf
    • http://heatherclc.com/uploads/1/3/0/4/130436171/53e70b.pdf
    • http://drfuentes.net/uploads/1/3/0/5/130550952/xemivaziriwik.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_off00008522.bin
406c453d683ad97206a4d0bb38f1d877b851fbf6c4a4b29ed2282bb6914ba032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 7956 bytes
font_01_sfnt_off0000a3d8.bin
2ff5e98b91ed82cdca528bb04e286403acf299cd3990cf729e398da5d165bcc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D8 16040 bytes

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