Malicious PDF — malware analysis report

Static analysis result for SHA-256 669357b007dea559…

MALICIOUS

PDF

68.0 KB Created: 2020-04-01 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6062e9f54bc762a8e37d8f0fc5076c6f SHA-1: 11c045d9fe218608ecdb8435b90681772b462703 SHA-256: 669357b007dea559e6a4c2c30e8820794acf25a6e35f14f15744a77bd99cbe4a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content or engage in SEO spamming. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, indicating it was likely generated programmatically.

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://headonltd.com/uploads/1/3/1/3/131381435/131381435.html#cambridge+y+la+teoria+cuantitativa+del+dinero
    • http://idreamsdestinations.com/uploads/1/3/0/7/130776220/noratadinaviwa-mapagiki-gaganovo.pdf
    • http://nuzzun.com/uploads/1/3/0/5/130545745/6a362da6af869cb.pdf
    • http://henrimaddocks.com/uploads/1/3/0/4/130483285/fifozorowi.pdf
    • http://ahmanique.net/uploads/1/3/0/5/130589278/2ecc060447b.pdf
    • http://richbarbershop.com/uploads/1/3/0/4/130483667/5713191.pdf
    • http://sponsoring.com/uploads/1/3/0/7/130776158/5411674.pdf
    • http://retailoriented.se/uploads/1/3/1/1/131163777/7b31fd.pdf
    • http://jessicastameyshairbydesign.com/uploads/1/3/0/7/130739133/dc9b04e3.pdf
    • http://ubwood.com/uploads/1/3/0/8/130813401/ea142ec.pdf
    • http://edensburglutheran.org/uploads/1/3/0/6/130621013/9793660.pdf
    • http://megabitpazari.com/uploads/1/3/0/5/130539243/d28cef1335.pdf
    • http://primecustomer.org/uploads/1/3/0/3/130323822/defc5b72369.pdf
    • http://findjillian.com/uploads/1/3/1/3/131398075/terifixowemamifaxe.pdf
    • http://apfexcellence.com/uploads/1/3/0/3/130312969/5755173.pdf
    • http://oregonhomeinspectionpros.com/uploads/1/3/0/2/130289719/jumerikexure.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_off0000dfd1.bin
593317dc368eaf8cdc3395c0cf512b89b80849bf95ec4b0c855fc3a08ff6f660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 8892 bytes

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