Malicious PDF — malware analysis report

Static analysis result for SHA-256 154dfb32c189d72f…

MALICIOUS

PDF

42.7 KB Created: 2020-04-12 17:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 62aeb77d613048804213904a8751bd5d SHA-1: 6cd154e0f59eebd99744f887bec42dab1e66d9dc SHA-256: 154dfb32c189d72f004876bb9fb5c3a62510bdb63a0011a047a68178bbba745b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could be used for SEO spam or to distribute further malware.

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://sonlighthouse.com/uploads/1/3/1/3/131384255/131384255.html#concepto+de+maduracion+en+psicologia+evolutiva
    • http://theuglypeacock.com/uploads/1/3/0/5/130588867/rofudivexak.pdf
    • http://addiesfaithhouse.org/uploads/1/3/0/6/130604546/9633329.pdf
    • http://mmracing20j.com/uploads/1/3/0/7/130775659/33062.pdf
    • http://fallbrawlapparel.com/uploads/1/3/1/0/131070116/zujaxajubaf.pdf
    • http://sno-ops.org/uploads/1/3/0/5/130588412/2693179.pdf
    • http://power4lifenow.com/uploads/1/3/1/3/131383314/golaze_ruvujeduxubirul_gufotutobe.pdf
    • http://entertainmentgurus.net/uploads/1/3/1/3/131397973/79dbcda1f.pdf
    • http://fiftythreestations.com/uploads/1/3/1/3/131378988/dobanebiritovo.pdf
    • http://aussiebeachfun.net/uploads/1/3/0/5/130589260/e9da9d6baf3.pdf
    • http://enchantedonlineboutique.com/uploads/1/3/0/7/130740498/kutupu.pdf
    • http://adacalifornia.com/uploads/1/3/1/4/131406801/5683491.pdf
    • http://iaminclusive.com/uploads/1/3/0/5/130590111/a7b5b0c.pdf
    • http://askercarspa.com/uploads/1/3/1/4/131452804/mafeto-keruza-penafido-nonomulit.pdf
    • http://grassrootsgardening.org/uploads/1/3/1/4/131483343/satukoziles.pdf
    • http://hopeeministries.net/uploads/1/3/0/7/130740349/bunomoxezigez.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_off00007cdb.bin
6c84b7c270e21971b8f25d8526c4b3c25ae8a57090cd529936e5e6618427af07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 8792 bytes

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