Malicious PDF — malware analysis report

Static analysis result for SHA-256 021ca1b5f6aedfd3…

MALICIOUS

PDF

38.3 KB Created: 2020-04-07 05:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7bf122456c84d179d00c9a0e4f67c1fe SHA-1: f7a514a0bb93c9927106be2fa715b4668873f8c0 SHA-256: 021ca1b5f6aedfd39683a9c80b8792a8297025e0ff2a9d7e52215d147f4f926d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be directing users to a multitude of other PDF documents hosted on various domains. While no specific malicious script was extracted, the sheer volume and nature of these links suggest a malicious intent, potentially for SEO manipulation or to distribute further malware. The ML classifier strongly supports the malicious verdict.

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://gotraber.com/uploads/1/3/0/7/130775002/130775002.html#paul+fussell+class+ebook
    • http://youngwomenestablishments.com/uploads/1/3/0/8/130813554/sakixexig.pdf
    • http://docebri.com/uploads/1/3/0/2/130287866/xojorenib-mofovemuwug.pdf
    • http://bcsgrubbox.com/uploads/1/3/1/3/131383207/3258170.pdf
    • http://afhbuilders.com/uploads/1/3/0/7/130738778/togemaxivofaka-tizejirop-pawogere.pdf
    • http://ellieapitts.com/uploads/1/3/0/5/130544072/749c615ed73f.pdf
    • http://artsvincent.com/uploads/1/3/0/2/130289773/9167927.pdf
    • http://sacrederotictouch.net/uploads/1/3/0/7/130738806/wijalizajumesoba.pdf
    • http://viewourbenefits.com/uploads/1/3/0/4/130476205/lenajezenafutu_tubugoporam_kuratupa.pdf
    • http://flashmartialarts.com/uploads/1/3/1/0/131070301/bojusativowazedu.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_off00006d60.bin
1a9bdc6808b5fb2bfbfda98323f22fd069001efa6940af72628c51526b1cdfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D60 8292 bytes

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