Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21ebfdcdf1ebfff…

MALICIOUS

PDF

41.4 KB Created: 2020-05-18 04:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5ce6cbbb756dff6015f09b52af21ea SHA-1: 667579610b91e67c803ea2634baf7696cab9fd7b SHA-256: f21ebfdcdf1ebfff7468707924e313af1b31374a8dd565ae6e41bb3438c34ddc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary URL found in the document body, 'http://thistlesandthorns.net/uploads/1/3/1/4/131406321/131406321.html#cheap+acrylic+sheets+amazon', and numerous other similar URLs point to PDF files hosted on various domains. This suggests a campaign focused on SEO manipulation or distributing further malicious content through these linked PDFs.

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://thistlesandthorns.net/uploads/1/3/1/4/131406321/131406321.html#cheap+acrylic+sheets+amazon
    • http://paulloveslauren.com/uploads/1/3/1/6/131606366/b3b3158.pdf
    • http://tentenbus.net/uploads/1/3/0/8/130813957/c5e971d38c43.pdf
    • http://warhorsestorage.com/uploads/1/3/0/4/130476642/wuzetifarugoze.pdf
    • http://maarandcompany.com/uploads/1/3/0/6/130604285/1628444.pdf
    • http://ocflorista.com/uploads/1/3/0/5/130551342/1145531.pdf
    • http://turkeytrackwines.com/uploads/1/3/0/2/130270879/tirolanufemadud_votaxopola_zezofogigewoza_zesawabamemax.pdf
    • http://onlineartshow.net/uploads/1/3/0/6/130621765/578389.pdf
    • http://kristinenriquez.com/uploads/1/3/1/4/131453127/5caaf55f6d.pdf
    • http://macarthurbraids.com/uploads/1/3/1/1/131164472/fasigamasetel.pdf
    • http://royaltyorganix.com/uploads/1/3/1/1/131164218/zarojapojuwu.pdf
    • http://flaircommunity.com/uploads/1/3/1/6/131636587/6830512.pdf
    • http://elitelinesny.com/uploads/1/3/0/5/130540789/0a565d6a5a326.pdf
    • http://balancedfengshui.com/uploads/1/3/0/6/130604067/8440660.pdf
    • http://kabadventures.com/uploads/1/3/1/3/131380438/pamarepogule.pdf
    • http://confianza-digital.com/uploads/1/3/0/4/130488395/5868339.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_off0000758c.bin
c9a69b7899ec551bef3ea669e21b1f26bcbfe58f3476a21574bb616bbb60d2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758C 10892 bytes

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